diff --git a/class/class-mainwp-child-branding.php b/class/class-mainwp-child-branding.php
index c36c75c..ad73640 100644
--- a/class/class-mainwp-child-branding.php
+++ b/class/class-mainwp-child-branding.php
@@ -246,7 +246,7 @@ class MainWP_Child_Branding {
 				$extra_setting['login_image'] = array();
 			} else {
 				try {
-					$upload = $this->upload_image( $settings['child_login_image_url'] );
+					$upload = $this->branding_upload_image( $settings['child_login_image_url'] );
 					if ( null !== $upload ) {
 						$extra_setting['login_image'] = array(
 							'path' => $upload['path'],
@@ -272,7 +272,7 @@ class MainWP_Child_Branding {
 				$extra_setting['favico_image'] = array();
 			} else {
 				try {
-					$upload = $this->upload_image( $settings['child_favico_image_url'] );
+					$upload = $this->branding_upload_image( $settings['child_favico_image_url'] );
 					if ( null !== $upload ) {
 						$extra_setting['favico_image'] = array(
 							'path' => $upload['path'],
@@ -313,7 +313,7 @@ class MainWP_Child_Branding {
 		return $information;
 	}
 
-	public static function upload_image( $img_url ) {
+	public static function branding_upload_image( $img_url ) {
 		include_once ABSPATH . 'wp-admin/includes/file.php';
 
 		add_filter( 'http_request_args', array( MainWP_Helper::get_class_name(), 'reject_unsafe_urls' ), 99, 2 );
diff --git a/class/class-mainwp-child-callable.php b/class/class-mainwp-child-callable.php
index 55f5120..4d48d15 100644
--- a/class/class-mainwp-child-callable.php
+++ b/class/class-mainwp-child-callable.php
@@ -97,7 +97,45 @@ class MainWP_Child_Callable {
 		}
 		return self::$instance;
 	}
+	
+	public function init_call_functions( $auth ) {
+		$callable  = false;
+		$func_auth = false;
 
+		$callable_no_auth = false;
+		$func_no_auth     = false;
+
+		// check to execute mainwp child's callable functions.
+		if ( isset( $_POST['function'] ) ) {
+			$func     = $_POST['function'];
+			$callable = $this->is_callable_function( $func );
+			if ( $callable ) {
+				$func_auth = $func;
+			}
+
+			if ( ! $callable ) {
+				$callable_no_auth = $this->is_callable_function_no_auth( $func );
+				if ( $callable_no_auth ) {
+					$func_no_auth = $func;
+				}
+			}
+		}
+
+		// Call the function required.
+		if ( $auth && isset( $_POST['function'] ) && $callable ) {
+			define( 'DOING_CRON', true );
+			MainWP_Helper::handle_fatal_error();
+			MainWP_Utility::fix_for_custom_themes();
+			$this->call_function( $func_auth );
+		} elseif ( isset( $_POST['function'] ) && $callable_no_auth ) {
+			define( 'DOING_CRON', true );
+			MainWP_Utility::fix_for_custom_themes();
+			$this->call_function_no_auth( $func_no_auth );
+		} elseif ( isset( $_POST['function'] ) && isset( $_POST['mainwpsignature'] ) && ! $callable && ! $callable_no_auth ) {
+			MainWP_Helper::error( __( 'Required version has not been detected. Please, make sure that you are using the latest version of the MainWP Child plugin on your site.', 'mainwp-child' ) );
+		}
+	}
+	
 	public function is_callable_function( $func ) {
 		if ( isset( $this->callableFunctions[ $func ] ) ) {
 			return true;
@@ -1060,7 +1098,7 @@ class MainWP_Child_Callable {
 		}
 
 		try {
-			$upload = MainWP_Helper::upload_file( $file_url, $dir, $filename );
+			$upload = $this->uploader_upload_file( $file_url, $dir, $filename );
 			if ( null !== $upload ) {
 				$information['success'] = true;
 			}
@@ -1070,6 +1108,48 @@ class MainWP_Child_Callable {
 		mainwp_child_helper()->write( $information );
 	}
 
+	
+	public function uploader_upload_file( $file_url, $path, $file_name ) {
+		// to fix uploader extension rename htaccess file issue.
+		if ( '.htaccess' != $file_name && '.htpasswd' != $file_name ) {
+			$file_name = sanitize_file_name( $file_name );
+		}
+
+		$full_file_name = $path . DIRECTORY_SEPARATOR . $file_name;
+
+		$response = wp_remote_get(
+			$file_url,
+			array(
+				'timeout'  => 10 * 60 * 60,
+				'stream'   => true,
+				'filename' => $full_file_name,
+			)
+		);
+
+		if ( is_wp_error( $response ) ) {
+			unlink( $full_file_name );
+			throw new \Exception( 'Error: ' . $response->get_error_message() );
+		}
+
+		if ( 200 !== (int) wp_remote_retrieve_response_code( $response ) ) {
+			unlink( $full_file_name );
+			throw new \Exception( 'Error 404: ' . trim( wp_remote_retrieve_response_message( $response ) ) );
+		}
+		if ( '.phpfile.txt' === substr( $file_name, - 12 ) ) {
+			$new_file_name = substr( $file_name, 0, - 12 ) . '.php';
+			$new_file_name = $path . DIRECTORY_SEPARATOR . $new_file_name;
+			$moved         = rename( $full_file_name, $new_file_name );
+			if ( $moved ) {
+				return array( 'path' => $new_file_name );
+			} else {
+				unlink( $full_file_name );
+				throw new \Exception( 'Error: Copy file.' );
+			}
+		}
+
+		return array( 'path' => $full_file_name );
+	}
+	
 	public function wordpress_seo() {
 		\MainWP_WordPress_SEO::instance()->action();
 	}
diff --git a/class/class-mainwp-child-stats.php b/class/class-mainwp-child-stats.php
index b118055..cb45faf 100644
--- a/class/class-mainwp-child-stats.php
+++ b/class/class-mainwp-child-stats.php
@@ -38,7 +38,11 @@ class MainWP_Child_Stats {
 		return self::$instance;
 	}
 
-	// Show stats without login - only allowed while no account is added yet.
+	/**
+	 * 
+	 * Show stats without login - only allowed while no account is added yet.
+	 * 
+	 */	
 	public function get_site_stats_no_auth( $information = array() ) {
 		if ( get_option( 'mainwp_child_pubkey' ) ) {
 			$hint = '<br/>' . __( 'Hint: Go to the child site, deactivate and reactivate the MainWP Child plugin and try again.', 'mainwp-child' );
@@ -510,8 +514,6 @@ class MainWP_Child_Stats {
 
 
 	public function update_external_settings() {
-		$update_htaccess = false;
-
 		if ( isset( $_POST['cloneSites'] ) ) {
 			if ( '0' !== $_POST['cloneSites'] ) {
 				$arr = json_decode( urldecode( $_POST['cloneSites'] ), 1 );
@@ -527,17 +529,10 @@ class MainWP_Child_Stats {
 
 		if ( isset( $_POST['pluginDir'] ) ) {
 			if ( get_option( 'mainwp_child_pluginDir' ) !== $_POST['pluginDir'] ) {
-				MainWP_Helper::update_option( 'mainwp_child_pluginDir', $_POST['pluginDir'], 'yes' );
-				$update_htaccess = true;
+				MainWP_Helper::update_option( 'mainwp_child_pluginDir', $_POST['pluginDir'], 'yes' );				
 			}
 		} elseif ( false !== get_option( 'mainwp_child_pluginDir' ) ) {
 			MainWP_Helper::update_option( 'mainwp_child_pluginDir', false, 'yes' );
-			$update_htaccess = true;
-		}
-
-		if ( $update_htaccess ) {
-			global $mainWPChild;
-			$mainWPChild->update_htaccess( true );
 		}
 	}
 
diff --git a/class/class-mainwp-child.php b/class/class-mainwp-child.php
index 3826990..9541f42 100644
--- a/class/class-mainwp-child.php
+++ b/class/class-mainwp-child.php
@@ -55,15 +55,9 @@ class MainWP_Child {
 			MainWP_Helper::update_option( 'mainwp_child_plugin_version', self::$version, 'yes' );
 		}
 
-		$this->check_other_auth();
+		MainWP_Connect::instance()->check_other_auth();
 
-		MainWP_Clone::get()->init();
-		MainWP_Child_Server_Information::init();
-		MainWP_Client_Report::instance()->init();
-		MainWP_Child_Plugins_Check::instance();
-		MainWP_Child_Themes_Check::instance();
-
-		$this->run_saved_snippets();
+		$this->init_extensions();		
 
 		if ( ! get_option( 'mainwp_child_pubkey' ) ) {
 			MainWP_Child_Branding::instance()->save_branding_options( 'branding_disconnected', 'yes' );
@@ -74,7 +68,7 @@ class MainWP_Child {
 
 		if ( defined( 'DOING_CRON' ) && DOING_CRON ) {
 			if ( isset( $_GET['mainwp_child_run'] ) && ! empty( $_GET['mainwp_child_run'] ) ) {
-				add_action( 'init', array( $this, 'cron_active' ), PHP_INT_MAX );
+				add_action( 'init', array( MainWP_Utility::get_class_name(), 'cron_active' ), PHP_INT_MAX );
 			}
 		}
 	}
@@ -297,23 +291,6 @@ class MainWP_Child {
 		MainWP_Helper::update_option( 'mainwp_child_update_version', $this->update_version, 'yes' );
 	}
 
-	public function cron_active() {
-		if ( ! defined( 'DOING_CRON' ) || ! DOING_CRON ) {
-			return;
-		}
-		if ( empty( $_GET['mainwp_child_run'] ) || 'test' !== $_GET['mainwp_child_run'] ) {
-			return;
-		}
-		session_write_close();
-		header( 'Content-Type: text/html; charset=' . get_bloginfo( 'charset' ), true );
-		header( 'X-Robots-Tag: noindex, nofollow', true );
-		header( 'X-MainWP-Child-Version: ' . self::$version, true );
-		nocache_headers();
-		if ( 'test' == $_GET['mainwp_child_run'] ) {
-			die( 'MainWP Test' );
-		}
-		die( '' );
-	}
 
 	public function admin_notice() {
 		// Admin Notice...
@@ -345,51 +322,10 @@ class MainWP_Child {
 		load_plugin_textdomain( 'mainwp-child', false, dirname( dirname( plugin_basename( __FILE__ ) ) ) . '/languages/' );
 	}
 
-	public function check_other_auth() {
-		$auths = get_option( 'mainwp_child_auth' );
-
-		if ( ! $auths ) {
-			$auths = array();
-		}
-
-		if ( ! isset( $auths['last'] ) || $auths['last'] < mktime( 0, 0, 0, date( 'm' ), date( 'd' ), date( 'Y' ) ) ) { // phpcs:ignore -- local time.
-			// Generate code for today.
-			for ( $i = 0; $i < $this->maxHistory; $i ++ ) {
-				if ( ! isset( $auths[ $i + 1 ] ) ) {
-					continue;
-				}
-
-				$auths[ $i ] = $auths[ $i + 1 ];
-			}
-			$newI = $this->maxHistory + 1;
-			while ( isset( $auths[ $newI ] ) ) {
-				unset( $auths[ $newI ++ ] );
-			}
-			$auths[ $this->maxHistory ] = md5( MainWP_Helper::rand_string( 14 ) );
-			$auths['last']              = time();
-			MainWP_Helper::update_option( 'mainwp_child_auth', $auths, 'yes' );
-		}
-	}
-
-	public function is_valid_auth( $key ) {
-		$auths = get_option( 'mainwp_child_auth' );
-		if ( ! $auths ) {
-			return false;
-		}
-		for ( $i = 0; $i <= $this->maxHistory; $i ++ ) {
-			if ( isset( $auths[ $i ] ) && ( $auths[ $i ] === $key ) ) {
-				return true;
-			}
-		}
-
-		return false;
-	}
-
 	public function template_redirect() {
-		$this->maintenance_alert_404();
+		MainWP_Utility::instance()->maintenance_alert();
 	}
 
-
 	public function plugin_row_meta( $plugin_meta, $plugin_file ) {
 		if ( $this->plugin_slug !== $plugin_file ) {
 			return $plugin_meta;
@@ -820,128 +756,6 @@ class MainWP_Child {
 		return $this->maxHistory;
 	}
 
-	public function mod_rewrite_rules( $pRules ) {
-
-		$home_root = wp_parse_url( home_url() );
-		if ( isset( $home_root['path'] ) ) {
-			$home_root = trailingslashit( $home_root['path'] );
-		} else {
-			$home_root = '/';
-		}
-
-		$rules  = "<IfModule mod_rewrite.c>\n";
-		$rules .= "RewriteEngine On\n";
-		$rules .= "RewriteBase $home_root\n";
-
-		// add in the rules that don't redirect to WP's index.php (and thus shouldn't be handled by WP at all).
-		foreach ( $pRules as $match => $query ) {
-			// Apache 1.3 does not support the reluctant (non-greedy) modifier.
-			$match = str_replace( '.+?', '.+', $match );
-
-			$rules .= 'RewriteRule ^' . $match . ' ' . $home_root . $query . " [QSA,L]\n";
-		}
-
-		$rules .= "</IfModule>\n";
-
-		return $rules;
-	}
-
-	public function update_htaccess( $hard = false ) {
-		if ( ! $hard && defined( 'DOING_CRON' ) && DOING_CRON ) {
-			return;
-		}
-
-		if ( $hard ) {
-			include_once ABSPATH . '/wp-admin/includes/misc.php';
-
-			$home_path     = ABSPATH;
-			$htaccess_file = $home_path . '.htaccess';
-			if ( function_exists( 'save_mod_rewrite_rules' ) ) {
-				$rules = explode( "\n", '' );
-
-				insert_with_markers( $htaccess_file, 'MainWP', $rules );
-
-			}
-		}
-	}
-
-	public function check_login() {
-
-		if ( ! isset( $_POST['mainwpsignature'] ) || empty( $_POST['mainwpsignature'] ) ) {
-			return false;
-		}
-
-		$file = '';
-		if ( isset( $_REQUEST['f'] ) ) {
-			$file = $_REQUEST['f'];
-		} elseif ( isset( $_REQUEST['file'] ) ) {
-			$file = $_REQUEST['file'];
-		} elseif ( isset( $_REQUEST['fdl'] ) ) {
-			$file = $_REQUEST['fdl'];
-		}
-
-		$auth = $this->auth( isset( $_POST['mainwpsignature'] ) ? rawurldecode( $_POST['mainwpsignature'] ) : '', isset( $_POST['function'] ) ? $_POST['function'] : rawurldecode( ( isset( $_REQUEST['where'] ) ? $_REQUEST['where'] : $file ) ), isset( $_POST['nonce'] ) ? $_POST['nonce'] : '', isset( $_POST['nossl'] ) ? $_POST['nossl'] : 0 );
-
-		if ( ! $auth ) {
-			MainWP_Helper::error( __( 'Authentication failed! Please deactivate and re-activate the MainWP Child plugin on this site.', 'mainwp-child' ) );
-		}
-
-		$auth_user = false;
-		if ( $auth ) {
-			// disable duo auth for mainwp.
-			remove_action( 'init', 'duo_verify_auth', 10 );
-
-			// Check if the user exists & is an administrator.
-			if ( isset( $_POST['function'] ) && isset( $_POST['user'] ) ) {
-
-				$user = null;
-
-				if ( isset( $_POST['alt_user'] ) && ! empty( $_POST['alt_user'] ) ) {
-					if ( $this->check_login_as( $_POST['alt_user'] ) ) {
-						$auth_user = $_POST['alt_user'];
-						$user      = get_user_by( 'login', $auth_user );
-					}
-				}
-
-				// if not valid alternative admin.
-				if ( ! $user ) {
-					// check connected admin existed.
-					$user      = get_user_by( 'login', $_POST['user'] );
-					$auth_user = $_POST['user'];
-				}
-
-				if ( ! $user ) {
-					MainWP_Helper::error( __( 'That administrator username was not found on this child site. Please verify that it is an existing administrator.', 'mainwp-child' ) );
-				}
-
-				if ( 10 != $user->wp_user_level && ( ! isset( $user->user_level ) || 10 != $user->user_level ) && ! $user->has_cap( 'level_10' ) ) {
-					MainWP_Helper::error( __( 'That user is not an administrator. Please use an administrator user to establish the connection.', 'mainwp-child' ) );
-				}
-
-				$this->login( $auth_user );
-			}
-
-			if ( isset( $_POST['function'] ) && 'visitPermalink' === $_POST['function'] ) {
-
-				if ( empty( $auth_user ) ) {
-					$auth_user = $_POST['user'];
-				}
-
-				if ( $this->login( $auth_user, true ) ) {
-					return;
-				} else {
-					exit();
-				}
-			}
-
-			// Redirect to the admin part if needed.
-			if ( isset( $_POST['admin'] ) && '1' === $_POST['admin'] ) {
-				wp_safe_redirect( get_option( 'siteurl' ) . '/wp-admin/' );
-				die();
-			}
-		}
-	}
-
 	public function parse_init() {
 
 		if ( isset( $_REQUEST['cloneFunc'] ) ) {
@@ -971,12 +785,10 @@ class MainWP_Child {
 			MainWP_Helper::update_option( 'mainwp_child_fix_htaccess', 'yes', 'yes' );
 		}
 
-		$this->update_htaccess();
-
 		// if login required.
 		if ( isset( $_REQUEST['login_required'] ) && ( '1' === $_REQUEST['login_required'] ) && isset( $_REQUEST['user'] ) ) {
-			$valid_login_required = $this->parse_login_required();
-			// retunr parse init if login required are not valid.
+			$valid_login_required = MainWP_Connect::instance()->parse_login_required();
+			// return parse init if login required are not valid.
 			if ( ! $valid_login_required ) {
 				return;
 			}
@@ -991,11 +803,15 @@ class MainWP_Child {
 		// Register does not require auth, so we register here.
 		if ( isset( $_POST['function'] ) && 'register' === $_POST['function'] ) {
 			define( 'DOING_CRON', true );
-			self::fix_for_custom_themes();
-			$this->register_site();
+			MainWP_Utility::fix_for_custom_themes();
+			MainWP_Connect::instance()->register_site(); // register the site.
 		}
 
-		$auth = $this->auth( isset( $_POST['mainwpsignature'] ) ? $_POST['mainwpsignature'] : '', isset( $_POST['function'] ) ? $_POST['function'] : '', isset( $_POST['nonce'] ) ? $_POST['nonce'] : '', isset( $_POST['nossl'] ) ? $_POST['nossl'] : 0 );
+		// if auth connect are not valid then exit or return.
+		if ( ! MainWP_Connect::instance()->parse_init_auth() )
+			return;
+		
+		$auth = MainWP_Connect::instance()->auth( isset( $_POST['mainwpsignature'] ) ? $_POST['mainwpsignature'] : '', isset( $_POST['function'] ) ? $_POST['function'] : '', isset( $_POST['nonce'] ) ? $_POST['nonce'] : '', isset( $_POST['nossl'] ) ? $_POST['nossl'] : 0 );
 
 		if ( ! $auth && isset( $_POST['mainwpsignature'] ) ) {
 			MainWP_Helper::error( __( 'Authentication failed! Please deactivate & re-activate the MainWP Child plugin on this site and try again.', 'mainwp-child' ) );
@@ -1018,7 +834,7 @@ class MainWP_Child {
 
 				$user = null;
 				if ( isset( $_POST['alt_user'] ) && ! empty( $_POST['alt_user'] ) ) {
-					if ( $this->check_login_as( $_POST['alt_user'] ) ) {
+					if ( MainWP_Connect::instance()->check_login_as( $_POST['alt_user'] ) ) {
 						$auth_user = $_POST['alt_user'];
 						$user      = get_user_by( 'login', $auth_user );
 					}
@@ -1039,7 +855,7 @@ class MainWP_Child {
 					MainWP_Helper::error( __( 'Invalid user. Please verify that the user has administrator privileges.', 'mainwp-child' ) );
 				}
 
-				$this->login( $auth_user );
+				MainWP_Connect::instance()->login( $auth_user );
 			}
 
 			if ( isset( $_POST['function'] ) && 'visitPermalink' === $_POST['function'] ) {
@@ -1048,7 +864,7 @@ class MainWP_Child {
 					$auth_user = $_POST['user'];
 				}
 
-				if ( $this->login( $auth_user, true ) ) {
+				if ( MainWP_Connect::instance()->login( $auth_user, true ) ) {
 					return;
 				} else {
 					exit();
@@ -1063,315 +879,32 @@ class MainWP_Child {
 		}
 
 		// Init extensions.
-		$this->init_extensions();
+		$this->parse_init_extensions();
 
 		global $_wp_submenu_nopriv;
 		if ( null === $_wp_submenu_nopriv ) {
 			$_wp_submenu_nopriv = array(); // phpcs:ignore -- to fix warning.
 		}
 
-		$this->parse_callable_functions( $auth );
-		$this->parse_keyword_links();
+		MainWP_Child_Callable::get_instance()->init_call_functions( $auth );
+		
+		MainWP_Keyword_Links::instance()->parse_init_keyword_links();
+	}
+	
+	public function check_login() {
+		MainWP_Connect::instance()->check_login();
 	}
 
-
-	private function parse_login_required() {
-
-		global $current_user;
-
-		$alter_login_required = false;
-		$username             = rawurldecode( $_REQUEST['user'] );
-
-		if ( isset( $_REQUEST['alt_user'] ) && ! empty( $_REQUEST['alt_user'] ) ) {
-			$alter_login_required = $this->check_login_as( $_REQUEST['alt_user'] );
-
-			if ( $alter_login_required ) {
-				$username = rawurldecode( $_REQUEST['alt_user'] );
-			}
-		}
-
-		if ( is_user_logged_in() ) {
-			global $current_user;
-			if ( 10 !== $current_user->wp_user_level && ( ! isset( $current_user->user_level ) || 10 !== $current_user->user_level ) && ! current_user_can( 'level_10' ) ) {
-				do_action( 'wp_logout' );
-			}
-		}
-
-		$signature = rawurldecode( isset( $_REQUEST['mainwpsignature'] ) ? $_REQUEST['mainwpsignature'] : '' );
-		$file      = '';
-		if ( isset( $_REQUEST['f'] ) ) {
-			$file = $_REQUEST['f'];
-		} elseif ( isset( $_REQUEST['file'] ) ) {
-			$file = $_REQUEST['file'];
-		} elseif ( isset( $_REQUEST['fdl'] ) ) {
-			$file = $_REQUEST['fdl'];
-		}
-
-		$auth = $this->auth( $signature, rawurldecode( ( isset( $_REQUEST['where'] ) ? $_REQUEST['where'] : $file ) ), isset( $_REQUEST['nonce'] ) ? $_REQUEST['nonce'] : '', isset( $_REQUEST['nossl'] ) ? $_REQUEST['nossl'] : 0 );
-		if ( ! $auth ) {
-			return;
-		}
-
-		if ( ! is_user_logged_in() || $username !== $current_user->user_login ) {
-			if ( ! $this->login( $username ) ) {
-				return;
-			}
-
-			global $current_user;
-			if ( 10 !== $current_user->wp_user_level && ( ! isset( $current_user->user_level ) || 10 !== $current_user->user_level ) && ! current_user_can( 'level_10' ) ) {
-				// if is not alternative admin login.
-				// it is connected admin login.
-				if ( ! $alter_login_required ) {
-					// log out if connected admin is not admin level 10.
-					do_action( 'wp_logout' );
-
-					return;
-				}
-			}
-		}
-
-		if ( isset( $_REQUEST['fdl'] ) ) {
-			if ( stristr( $_REQUEST['fdl'], '..' ) ) {
-				return;
-			}
-
-			$this->upload_file( $_REQUEST['fdl'], isset( $_REQUEST['foffset'] ) ? $_REQUEST['foffset'] : 0 );
-			exit;
-		}
-
-		$where = isset( $_REQUEST['where'] ) ? $_REQUEST['where'] : '';
-		if ( isset( $_POST['f'] ) || isset( $_POST['file'] ) ) {
-			$file = '';
-			if ( isset( $_POST['f'] ) ) {
-				$file = $_POST['f'];
-			} elseif ( isset( $_POST['file'] ) ) {
-				$file = $_POST['file'];
-			}
-
-			$where = 'admin.php?page=mainwp_child_tab&tab=restore-clone';
-			if ( '' === session_id() ) {
-				session_start();
-			}
-			$_SESSION['file'] = $file;
-			$_SESSION['size'] = $_POST['size'];
-		}
-
-		// to support open not wp-admin url.
-		$open_location = isset( $_REQUEST['open_location'] ) ? $_REQUEST['open_location'] : '';
-		if ( ! empty( $open_location ) ) {
-			$open_location = base64_decode( $open_location ); // phpcs:ignore WordPress.PHP.DiscouragedPHPFunctions -- base64_encode function is used for begin reasons.
-			$_vars         = MainWP_Helper::parse_query( $open_location );
-			$_path         = wp_parse_url( $open_location, PHP_URL_PATH );
-			if ( isset( $_vars['_mwpNoneName'] ) && isset( $_vars['_mwpNoneValue'] ) ) {
-				$_vars[ $_vars['_mwpNoneName'] ] = wp_create_nonce( $_vars['_mwpNoneValue'] );
-				unset( $_vars['_mwpNoneName'] );
-				unset( $_vars['_mwpNoneValue'] );
-				$open_url = '';
-				foreach ( $_vars as $key => $value ) {
-					$open_url .= $key . '=' . $value . '&';
-				}
-				$open_url      = rtrim( $open_url, '&' );
-				$open_location = '/wp-admin/' . $_path . '?' . $open_url;
-			} else {
-				if ( strpos( $open_location, 'nonce=child_temp_nonce' ) !== false ) {
-					$open_location = str_replace( 'nonce=child_temp_nonce', 'nonce=' . wp_create_nonce( 'wp-ajax' ), $open_location );
-				}
-			}
-			wp_safe_redirect( site_url() . $open_location );
-			exit();
-		}
-
-		wp_safe_redirect( admin_url( $where ) );
-
-		exit();
+	private function init_extensions() {		
+		MainWP_Clone::get()->init();
+		MainWP_Child_Server_Information::init();
+		MainWP_Client_Report::instance()->init();
+		MainWP_Child_Plugins_Check::instance();
+		MainWP_Child_Themes_Check::instance();
+		MainWP_Utility::instance()->run_saved_snippets();
 	}
-
-
-	private function parse_callable_functions( $auth ) {
-		$callable  = false;
-		$func_auth = false;
-
-		$callable_no_auth = false;
-		$func_no_auth     = false;
-
-		// check to execute mainwp child's callable functions.
-		if ( isset( $_POST['function'] ) ) {
-			$func     = $_POST['function'];
-			$callable = MainWP_Child_Callable::get_instance()->is_callable_function( $func );
-			if ( $callable ) {
-				$func_auth = $func;
-			}
-
-			if ( ! $callable ) {
-				$callable_no_auth = MainWP_Child_Callable::get_instance()->is_callable_function_no_auth( $func );
-				if ( $callable_no_auth ) {
-					$func_no_auth = $func;
-				}
-			}
-		}
-
-		// Call the function required.
-		if ( $auth && isset( $_POST['function'] ) && $callable ) {
-			define( 'DOING_CRON', true );
-			MainWP_Helper::handle_fatal_error();
-			self::fix_for_custom_themes();
-			MainWP_Child_Callable::get_instance()->call_function( $func_auth );
-		} elseif ( isset( $_POST['function'] ) && $callable_no_auth ) {
-			define( 'DOING_CRON', true );
-			self::fix_for_custom_themes();
-			MainWP_Child_Callable::get_instance()->call_function_no_auth( $func_no_auth );
-		} elseif ( isset( $_POST['function'] ) && isset( $_POST['mainwpsignature'] ) && ! $callable && ! $callable_no_auth ) {
-			MainWP_Helper::error( __( 'Required version has not been detected. Please, make sure that you are using the latest version of the MainWP Child plugin on your site.', 'mainwp-child' ) );
-		}
-	}
-
-	// Check to support login by alternative admin.
-	// return false will login by connected admin user.
-	// return true will try to login as alternative user.
-	public function check_login_as( $alter_login ) {
-
-		if ( ! empty( $alter_login ) ) {
-			// check alternative admin existed.
-			$user = get_user_by( 'login', $alter_login );
-
-			if ( ! $user ) {
-				// That administrator username was not found on this child site.
-				return false;
-			}
-
-			if ( 10 != $user->wp_user_level && ( ! isset( $user->user_level ) || 10 != $user->user_level ) && ! $user->has_cap( 'level_10' ) ) {
-				// That user is not an administrator.
-				return false;
-			}
-
-			return true; // ok, will try to login by alternative user.
-		}
-
-		return false;
-	}
-
-	public function auth( $signature, $func, $nonce, $pNossl ) {
-		if ( empty( $signature ) || ! isset( $func ) || ( ! get_option( 'mainwp_child_pubkey' ) && ! get_option( 'mainwp_child_nossl_key' ) ) ) {
-			$auth = false;
-		} else {
-			$nossl       = get_option( 'mainwp_child_nossl' );
-			$serverNoSsl = ( isset( $pNossl ) && 1 === (int) $pNossl );
-
-			if ( ( 1 === (int) $nossl ) || $serverNoSsl ) {
-				$nossl_key = get_option( 'mainwp_child_nossl_key' );
-				$auth      = hash_equals( md5( $func . $nonce . $nossl_key ), base64_decode( $signature ) ); // // phpcs:ignore WordPress.PHP.DiscouragedPHPFunctions -- base64_encode function is used for begin reasons.								
-			} else {
-				$auth = openssl_verify( $func . $nonce, base64_decode( $signature ), base64_decode( get_option( 'mainwp_child_pubkey' ) ) ); // phpcs:ignore WordPress.PHP.DiscouragedPHPFunctions -- base64_encode function is used for begin reasons.
-				if ( 1 !== $auth ) {
-					$auth = false;
-				}
-			}
-		}
-
-		return $auth;
-	}
-
-	// Login.
-	public function login( $username, $doAction = false ) {
-		global $current_user;
-
-		// Logout if required.
-		if ( isset( $current_user->user_login ) ) {
-			if ( $current_user->user_login === $username ) {
-
-				// to fix issue multi user session.
-				$user_id = wp_validate_auth_cookie();
-				if ( $user_id && $user_id === $current_user->ID ) {
-					return true;
-				}
-
-				wp_set_auth_cookie( $current_user->ID );
-				return true;
-			}
-			do_action( 'wp_logout' );
-		}
-
-		$user = get_user_by( 'login', $username );
-		if ( $user ) {
-			wp_set_current_user( $user->ID );
-			wp_set_auth_cookie( $user->ID );
-			if ( $doAction ) {
-				do_action( 'wp_login', $user->user_login );
-			}
-
-			return ( is_user_logged_in() && $current_user->user_login === $username );
-		}
-
-		return false;
-	}
-
-
-	// This will register the current wp - thus generating the public key etc.
-	public function register_site() {
-		global $current_user;
-
-		$information = array();
-		// Check if the user is valid & login.
-		if ( ! isset( $_POST['user'] ) || ! isset( $_POST['pubkey'] ) ) {
-			MainWP_Helper::error( __( 'Invalid request!', 'mainwp-child' ) );
-		}
-
-		// Already added - can't readd. Deactivate plugin.
-		if ( get_option( 'mainwp_child_pubkey' ) ) {
-			// set disconnect status to yes here, it will empty after reconnected.
-			MainWP_Child_Branding::instance()->save_branding_options( 'branding_disconnected', 'yes' );
-			MainWP_Helper::error( __( 'Public key already set. Please deactivate & reactivate the MainWP Child plugin and try again.', 'mainwp-child' ) );
-		}
-
-		if ( '' != get_option( 'mainwp_child_uniqueId' ) ) {
-			if ( ! isset( $_POST['uniqueId'] ) || ( '' === $_POST['uniqueId'] ) ) {
-				MainWP_Helper::error( __( 'This child site is set to require a unique security ID. Please enter it before the connection can be established.', 'mainwp-child' ) );
-			} elseif ( get_option( 'mainwp_child_uniqueId' ) !== $_POST['uniqueId'] ) {
-				MainWP_Helper::error( __( 'The unique security ID mismatch! Please correct it before the connection can be established.', 'mainwp-child' ) );
-			}
-		}
-
-		// Check SSL Requirement.
-		if ( ! MainWP_Helper::is_ssl_enabled() && ( ! defined( 'MAINWP_ALLOW_NOSSL_CONNECT' ) || ! MAINWP_ALLOW_NOSSL_CONNECT ) ) {
-			MainWP_Helper::error( __( 'SSL is required on the child site to set up a secure connection.', 'mainwp-child' ) );
-		}
-
-		// Login.
-		if ( isset( $_POST['user'] ) ) {
-			if ( ! $this->login( $_POST['user'] ) ) {
-				$hint_miss_user = __( 'That administrator username was not found on this child site. Please verify that it is an existing administrator.', 'mainwp-child' ) . '<br/>' . __( 'Hint: Check if the administrator user exists on the child site, if not, you need to use an existing administrator.', 'mainwp-child' );
-				MainWP_Helper::error( $hint_miss_user );
-			}
-
-			if ( 10 !== $current_user->wp_user_level && ( ! isset( $current_user->user_level ) || 10 !== $current_user->user_level ) && ! $current_user->has_cap( 'level_10' ) ) {
-				MainWP_Helper::error( __( 'That user is not an administrator. Please use an administrator user to establish the connection.', 'mainwp-child' ) );
-			}
-		}
-
-		MainWP_Helper::update_option( 'mainwp_child_pubkey', base64_encode( $_POST['pubkey'] ), 'yes' ); // phpcs:ignore WordPress.PHP.DiscouragedPHPFunctions -- base64_encode function is used for begin reasons.
-		MainWP_Helper::update_option( 'mainwp_child_server', $_POST['server'] ); // Save the public key.
-		MainWP_Helper::update_option( 'mainwp_child_nonce', 0 ); // Save the nonce.
-
-		MainWP_Helper::update_option( 'mainwp_child_nossl', ( '-1' === $_POST['pubkey'] || ! MainWP_Helper::is_ssl_enabled() ? 1 : 0 ), 'yes' );
-		$information['nossl'] = ( '-1' === $_POST['pubkey'] || ! MainWP_Helper::is_ssl_enabled() ? 1 : 0 );
-		if ( function_exists( 'random_bytes' ) ) {
-			$nossl_key = random_bytes( 32 );
-			$nossl_key = bin2hex( $nossl_key );
-		} else {
-			$nossl_key = uniqid( '', true );
-		}
-		MainWP_Helper::update_option( 'mainwp_child_nossl_key', $nossl_key, 'yes' );
-		$information['nosslkey'] = $nossl_key;
-
-		$information['register'] = 'OK';
-		$information['uniqueId'] = get_option( 'mainwp_child_uniqueId', '' );
-		$information['user']     = $_POST['user'];
-
-		MainWP_Child_Stats::get_instance()->get_site_stats( $information );
-	}
-
-
-	private function init_extensions() {
+	
+	private function parse_init_extensions() {
 		// Handle fatal errors for those init if needed.
 		\MainWP_Child_IThemes_Security::instance()->ithemes_init();
 		\MainWP_Child_Updraft_Plus_Backups::instance()->updraftplus_init();
@@ -1389,166 +922,6 @@ class MainWP_Child {
 		\MainWP_Child_WPvivid_BackupRestore::instance()->init();
 	}
 
-	private function parse_keyword_links() {
-
-		if ( 1 === (int) get_option( 'mainwpKeywordLinks' ) ) {
-			new MainWP_Keyword_Links();
-			if ( ! is_admin() ) {
-				add_filter( 'the_content', array( MainWP_Keyword_Links::instance(), 'filter_content' ), 100 );
-			}
-			MainWP_Keyword_Links::instance()->update_htaccess();
-			MainWP_Keyword_Links::instance()->redirect_cloak();
-		} elseif ( 'yes' === get_option( 'mainwp_keyword_links_htaccess_set' ) ) {
-			MainWP_Keyword_Links::clear_htaccess();
-		}
-	}
-
-	public function maintenance_alert_404() {
-		if ( ! is_404() ) {
-			return;
-		}
-
-		if ( 1 !== (int) get_option( 'mainwp_maintenance_opt_alert_404' ) ) {
-			return;
-		}
-
-		$email = get_option( 'mainwp_maintenance_opt_alert_404_email' );
-
-		if ( empty( $email ) || ! preg_match( '/^[a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+\.[a-zA-Z0-9-.]+$/is', $email ) ) {
-			return;
-		}
-
-		// set status.
-		header( 'HTTP/1.1 404 Not Found' );
-		header( 'Status: 404 Not Found' );
-
-		// site info.
-		$blog       = get_bloginfo( 'name' );
-		$site       = get_bloginfo( 'url' ) . '/';
-		$from_email = get_bloginfo( 'admin_email' );
-
-		// referrer.
-		if ( isset( $_SERVER['HTTP_REFERER'] ) ) {
-			$referer = MainWP_Helper::clean( $_SERVER['HTTP_REFERER'] );
-		} else {
-			$referer = 'undefined';
-		}
-		$protocol = isset( $_SERVER['HTTPS'] ) && strcasecmp( $_SERVER['HTTPS'], 'off' ) ? 'https://' : 'http://';
-		// request URI.
-		if ( isset( $_SERVER['REQUEST_URI'] ) && isset( $_SERVER['HTTP_HOST'] ) ) {
-			$request = MainWP_Helper::clean( $protocol . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'] );
-		} else {
-			$request = 'undefined';
-		}
-		// query string.
-		if ( isset( $_SERVER['QUERY_STRING'] ) ) {
-			$string = MainWP_Helper::clean( $_SERVER['QUERY_STRING'] );
-		} else {
-			$string = 'undefined';
-		}
-		// IP address.
-		if ( isset( $_SERVER['REMOTE_ADDR'] ) ) {
-			$address = MainWP_Helper::clean( $_SERVER['REMOTE_ADDR'] );
-		} else {
-			$address = 'undefined';
-		}
-		// user agent.
-		if ( isset( $_SERVER['HTTP_USER_AGENT'] ) ) {
-			$agent = MainWP_Helper::clean( $_SERVER['HTTP_USER_AGENT'] );
-		} else {
-			$agent = 'undefined';
-		}
-		// identity.
-		if ( isset( $_SERVER['REMOTE_IDENT'] ) ) {
-			$remote = MainWP_Helper::clean( $_SERVER['REMOTE_IDENT'] );
-		} else {
-			$remote = 'undefined';
-		}
-		// log time.
-		$time = MainWP_Helper::clean( date( 'F jS Y, h:ia', time() ) ); // phpcs:ignore -- local time.
-
-		$mail = '<div>404 alert</div><div></div>' .
-				'<div>TIME: ' . $time . '</div>' .
-				'<div>*404: ' . $request . '</div>' .
-				'<div>SITE: ' . $site . '</div>' .
-				'<div>REFERRER: ' . $referer . '</div>' .
-				'<div>QUERY STRING: ' . $string . '</div>' .
-				'<div>REMOTE ADDRESS: ' . $address . '</div>' .
-				'<div>REMOTE IDENTITY: ' . $remote . '</div>' .
-				'<div>USER AGENT: ' . $agent . '</div>';
-		wp_mail(
-			$email,
-			'MainWP - 404 Alert: ' . $blog,
-			MainWP_Helper::format_email( $email, $mail ),
-			array(
-				'content-type: text/html',
-			)
-		);
-	}
-
-	public function upload_file( $file, $offset = 0 ) {
-		$dirs      = MainWP_Helper::get_mainwp_dir( 'backup' );
-		$backupdir = $dirs[0];
-
-		header( 'Content-Description: File Transfer' );
-
-		header( 'Content-Description: File Transfer' );
-		if ( MainWP_Helper::ends_with( $file, '.tar.gz' ) ) {
-			header( 'Content-Type: application/x-gzip' );
-			header( 'Content-Encoding: gzip' );
-		} else {
-			header( 'Content-Type: application/octet-stream' );
-		}
-		header( 'Content-Disposition: attachment; filename="' . basename( $file ) . '"' );
-		header( 'Expires: 0' );
-		header( 'Cache-Control: must-revalidate' );
-		header( 'Pragma: public' );
-		header( 'Content-Length: ' . filesize( $backupdir . $file ) );
-		while ( ob_end_flush() ) {; // phpcs:ignore
-		}
-		$this->readfile_chunked( $backupdir . $file, $offset );
-	}
-
-	public function readfile_chunked( $filename, $offset ) {
-		$chunksize = 1024; // how many bytes per chunk?
-		$handle    = fopen( $filename, 'rb' );
-		if ( false === $handle ) {
-			return false;
-		}
-
-		fseek( $handle, $offset );
-
-		while ( ! feof( $handle ) ) {
-			$buffer = fread( $handle, $chunksize );
-			echo $buffer;
-			ob_flush();
-			flush();
-			$buffer = null;
-		}
-
-		return fclose( $handle );
-	}
-
-	public function run_saved_snippets() {
-		$action = null;
-		if ( isset( $_POST['action'] ) ) {
-			$action = $_POST['action'];
-		}
-
-		if ( 'run_snippet' === $action || 'save_snippet' === $action || 'delete_snippet' === $action ) {
-			return;
-		} // do not run saved snippets if in do action snippet
-
-		if ( get_option( 'mainwp_ext_snippets_enabled' ) ) {
-			$snippets = get_option( 'mainwp_ext_code_snippets' );
-			if ( is_array( $snippets ) && count( $snippets ) > 0 ) {
-				foreach ( $snippets as $code ) {
-					MainWP_Helper::execute_snippet( $code );
-				}
-			}
-		}
-	}
-
 
 	/*
 	 * hook to deactivation child plugin action
@@ -1613,13 +986,4 @@ class MainWP_Child {
 		}
 	}
 
-	public static function fix_for_custom_themes() {
-		if ( file_exists( ABSPATH . '/wp-admin/includes/screen.php' ) ) {
-			include_once ABSPATH . '/wp-admin/includes/screen.php';
-		}
-
-		if ( function_exists( 'et_register_updates_component' ) ) {
-			et_register_updates_component();
-		}
-	}
 }
diff --git a/class/class-mainwp-clone-install.php b/class/class-mainwp-clone-install.php
index 7a3ed22..160ce7c 100644
--- a/class/class-mainwp-clone-install.php
+++ b/class/class-mainwp-clone-install.php
@@ -615,10 +615,8 @@ class MainWP_Clone_Install {
 			return;
 		}
 
-			global $mainWPChild;
-
 		if ( 'dl' === $_REQUEST['cloneFunc'] ) {
-			$mainWPChild->upload_file( $_REQUEST['f'] );
+			MainWP_Utility::instance()->upload_file( $_REQUEST['f'] );
 			exit;
 		} elseif ( 'deleteCloneBackup' === $_POST['cloneFunc'] ) {
 			$dirs      = MainWP_Helper::get_mainwp_dir( 'backup' );
@@ -726,4 +724,20 @@ class MainWP_Clone_Install {
 		}
 			return true;
 	}
+	
+	
+	public function is_valid_auth( $key ) {
+		$auths = get_option( 'mainwp_child_auth' );
+		if ( ! $auths ) {
+			return false;
+		}
+		for ( $i = 0; $i <= $this->maxHistory; $i ++ ) {
+			if ( isset( $auths[ $i ] ) && ( $auths[ $i ] === $key ) ) {
+				return true;
+			}
+		}
+
+		return false;
+	}
+
 }
diff --git a/class/class-mainwp-connect.php b/class/class-mainwp-connect.php
new file mode 100644
index 0000000..34d62b0
--- /dev/null
+++ b/class/class-mainwp-connect.php
@@ -0,0 +1,464 @@
+<?php
+
+namespace MainWP\Child;
+
+class MainWP_Connect {
+	
+	public static $instance = null;
+
+	/**
+	 * Method get_class_name()
+	 *
+	 * Get Class Name.
+	 *
+	 * @return object
+	 */
+	public static function get_class_name() {
+		return __CLASS__;
+	}
+
+	public static function instance() {
+		if ( null === self::$instance ) {
+			self::$instance = new self();
+		}
+		return self::$instance;
+	}
+	
+	// This will register the current wp - thus generating the public key etc.
+	public function register_site() {
+		global $current_user;
+
+		$information = array();
+		// Check if the user is valid & login.
+		if ( ! isset( $_POST['user'] ) || ! isset( $_POST['pubkey'] ) ) {
+			MainWP_Helper::error( __( 'Invalid request!', 'mainwp-child' ) );
+		}
+
+		// Already added - can't readd. Deactivate plugin.
+		if ( get_option( 'mainwp_child_pubkey' ) ) {
+			// set disconnect status to yes here, it will empty after reconnected.
+			MainWP_Child_Branding::instance()->save_branding_options( 'branding_disconnected', 'yes' );
+			MainWP_Helper::error( __( 'Public key already set. Please deactivate & reactivate the MainWP Child plugin and try again.', 'mainwp-child' ) );
+		}
+
+		if ( '' != get_option( 'mainwp_child_uniqueId' ) ) {
+			if ( ! isset( $_POST['uniqueId'] ) || ( '' === $_POST['uniqueId'] ) ) {
+				MainWP_Helper::error( __( 'This child site is set to require a unique security ID. Please enter it before the connection can be established.', 'mainwp-child' ) );
+			} elseif ( get_option( 'mainwp_child_uniqueId' ) !== $_POST['uniqueId'] ) {
+				MainWP_Helper::error( __( 'The unique security ID mismatch! Please correct it before the connection can be established.', 'mainwp-child' ) );
+			}
+		}
+
+		// Check SSL Requirement.
+		if ( ! MainWP_Helper::is_ssl_enabled() && ( ! defined( 'MAINWP_ALLOW_NOSSL_CONNECT' ) || ! MAINWP_ALLOW_NOSSL_CONNECT ) ) {
+			MainWP_Helper::error( __( 'SSL is required on the child site to set up a secure connection.', 'mainwp-child' ) );
+		}
+
+		// Login.
+		if ( isset( $_POST['user'] ) ) {
+			if ( ! $this->login( $_POST['user'] ) ) {
+				$hint_miss_user = __( 'That administrator username was not found on this child site. Please verify that it is an existing administrator.', 'mainwp-child' ) . '<br/>' . __( 'Hint: Check if the administrator user exists on the child site, if not, you need to use an existing administrator.', 'mainwp-child' );
+				MainWP_Helper::error( $hint_miss_user );
+			}
+
+			if ( 10 !== $current_user->wp_user_level && ( ! isset( $current_user->user_level ) || 10 !== $current_user->user_level ) && ! $current_user->has_cap( 'level_10' ) ) {
+				MainWP_Helper::error( __( 'That user is not an administrator. Please use an administrator user to establish the connection.', 'mainwp-child' ) );
+			}
+		}
+
+		MainWP_Helper::update_option( 'mainwp_child_pubkey', base64_encode( $_POST['pubkey'] ), 'yes' ); // phpcs:ignore WordPress.PHP.DiscouragedPHPFunctions -- base64_encode function is used for begin reasons.
+		MainWP_Helper::update_option( 'mainwp_child_server', $_POST['server'] ); // Save the public key.
+		MainWP_Helper::update_option( 'mainwp_child_nonce', 0 ); // Save the nonce.
+
+		MainWP_Helper::update_option( 'mainwp_child_nossl', ( '-1' === $_POST['pubkey'] || ! MainWP_Helper::is_ssl_enabled() ? 1 : 0 ), 'yes' );
+		$information['nossl'] = ( '-1' === $_POST['pubkey'] || ! MainWP_Helper::is_ssl_enabled() ? 1 : 0 );
+		if ( function_exists( 'random_bytes' ) ) {
+			$nossl_key = random_bytes( 32 );
+			$nossl_key = bin2hex( $nossl_key );
+		} else {
+			$nossl_key = uniqid( '', true );
+		}
+		MainWP_Helper::update_option( 'mainwp_child_nossl_key', $nossl_key, 'yes' );
+		$information['nosslkey'] = $nossl_key;
+
+		$information['register'] = 'OK';
+		$information['uniqueId'] = get_option( 'mainwp_child_uniqueId', '' );
+		$information['user']     = $_POST['user'];
+
+		MainWP_Child_Stats::get_instance()->get_site_stats( $information );
+	}
+
+	
+	public function parse_init_auth() {
+		
+		$auth = $this->auth( isset( $_POST['mainwpsignature'] ) ? $_POST['mainwpsignature'] : '', isset( $_POST['function'] ) ? $_POST['function'] : '', isset( $_POST['nonce'] ) ? $_POST['nonce'] : '', isset( $_POST['nossl'] ) ? $_POST['nossl'] : 0 );
+		
+		if ( ! $auth && isset( $_POST['mainwpsignature'] ) ) {
+			MainWP_Helper::error( __( 'Authentication failed! Please deactivate & re-activate the MainWP Child plugin on this site and try again.', 'mainwp-child' ) );
+		}
+
+		if ( ! $auth && isset( $_POST['function'] ) ) {
+			$func             = $_POST['function'];
+			$callable         = MainWP_Child_Callable::get_instance()->is_callable_function( $func );
+			$callable_no_auth = MainWP_Child_Callable::get_instance()->is_callable_function_no_auth( $func );
+
+			if ( $callable && ! $callable_no_auth ) {
+				MainWP_Helper::error( __( 'Authentication failed! Please deactivate & re-activate the MainWP Child plugin on this site and try again.', 'mainwp-child' ) );
+			}
+		}
+
+		if ( $auth ) {
+			$auth_user = false;
+			// Check if the user exists & is an administrator.
+			if ( isset( $_POST['function'] ) && isset( $_POST['user'] ) ) {
+
+				$user = null;
+				if ( isset( $_POST['alt_user'] ) && ! empty( $_POST['alt_user'] ) ) {
+					if ( $this->check_login_as( $_POST['alt_user'] ) ) {
+						$auth_user = $_POST['alt_user'];
+						$user      = get_user_by( 'login', $auth_user );
+					}
+				}
+
+				// if alternative admin not existed.
+				if ( ! $user ) {
+					// check connected admin existed.
+					$user      = get_user_by( 'login', $_POST['user'] );
+					$auth_user = $_POST['user'];
+				}
+
+				if ( ! $user ) {
+					MainWP_Helper::error( __( 'Unexising administrator username. Please verify that it is an existing administrator.', 'mainwp-child' ) );
+				}
+
+				if ( 10 != $user->wp_user_level && ( ! isset( $user->user_level ) || 10 != $user->user_level ) && ! $user->has_cap( 'level_10' ) ) {
+					MainWP_Helper::error( __( 'Invalid user. Please verify that the user has administrator privileges.', 'mainwp-child' ) );
+				}
+
+				$this->login( $auth_user );
+			}
+
+			if ( isset( $_POST['function'] ) && 'visitPermalink' === $_POST['function'] ) {
+
+				if ( empty( $auth_user ) ) {
+					$auth_user = $_POST['user'];
+				}
+
+				if ( $this->login( $auth_user, true ) ) {
+					return false;
+				} else {
+					exit();
+				}
+			}
+
+			// Redirect to the admin side if needed.
+			if ( isset( $_POST['admin'] ) && '1' === $_POST['admin'] ) {
+				wp_safe_redirect( get_option( 'siteurl' ) . '/wp-admin/' );
+				die();
+			}
+		}
+		
+		return true;
+	}
+	
+	
+	public function auth( $signature, $func, $nonce, $pNossl ) {
+		if ( empty( $signature ) || ! isset( $func ) || ( ! get_option( 'mainwp_child_pubkey' ) && ! get_option( 'mainwp_child_nossl_key' ) ) ) {
+			$auth = false;
+		} else {
+			$nossl       = get_option( 'mainwp_child_nossl' );
+			$serverNoSsl = ( isset( $pNossl ) && 1 === (int) $pNossl );
+
+			if ( ( 1 === (int) $nossl ) || $serverNoSsl ) {
+				$nossl_key = get_option( 'mainwp_child_nossl_key' );
+				$auth      = hash_equals( md5( $func . $nonce . $nossl_key ), base64_decode( $signature ) ); // // phpcs:ignore WordPress.PHP.DiscouragedPHPFunctions -- base64_encode function is used for begin reasons.								
+			} else {
+				$auth = openssl_verify( $func . $nonce, base64_decode( $signature ), base64_decode( get_option( 'mainwp_child_pubkey' ) ) ); // phpcs:ignore WordPress.PHP.DiscouragedPHPFunctions -- base64_encode function is used for begin reasons.
+				if ( 1 !== $auth ) {
+					$auth = false;
+				}
+			}
+		}
+
+		return $auth;
+	}
+	
+	public function parse_login_required() {
+
+		global $current_user;
+
+		$alter_login_required = false;
+		$username             = rawurldecode( $_REQUEST['user'] );
+
+		if ( isset( $_REQUEST['alt_user'] ) && ! empty( $_REQUEST['alt_user'] ) ) {
+			$alter_login_required = MainWP_Connect::instance()->check_login_as( $_REQUEST['alt_user'] );
+			if ( $alter_login_required ) {
+				$username = rawurldecode( $_REQUEST['alt_user'] );
+			}
+		}
+
+		if ( is_user_logged_in() ) {
+			global $current_user;
+			if ( 10 !== $current_user->wp_user_level && ( ! isset( $current_user->user_level ) || 10 !== $current_user->user_level ) && ! current_user_can( 'level_10' ) ) {
+				do_action( 'wp_logout' );
+			}
+		}
+
+		$signature = rawurldecode( isset( $_REQUEST['mainwpsignature'] ) ? $_REQUEST['mainwpsignature'] : '' );
+		$file      = '';
+		if ( isset( $_REQUEST['f'] ) ) {
+			$file = $_REQUEST['f'];
+		} elseif ( isset( $_REQUEST['file'] ) ) {
+			$file = $_REQUEST['file'];
+		} elseif ( isset( $_REQUEST['fdl'] ) ) {
+			$file = $_REQUEST['fdl'];
+		}
+
+		$auth = MainWP_Connect::instance()->auth( $signature, rawurldecode( ( isset( $_REQUEST['where'] ) ? $_REQUEST['where'] : $file ) ), isset( $_REQUEST['nonce'] ) ? $_REQUEST['nonce'] : '', isset( $_REQUEST['nossl'] ) ? $_REQUEST['nossl'] : 0 );
+		
+		if ( ! $auth ) {
+			return;
+		}
+
+		if ( ! is_user_logged_in() || $username !== $current_user->user_login ) {
+			if ( ! $this->login( $username ) ) {
+				return;
+			}
+
+			global $current_user;
+			if ( 10 !== $current_user->wp_user_level && ( ! isset( $current_user->user_level ) || 10 !== $current_user->user_level ) && ! current_user_can( 'level_10' ) ) {
+				// if is not alternative admin login.
+				// it is connected admin login.
+				if ( ! $alter_login_required ) {
+					// log out if connected admin is not admin level 10.
+					do_action( 'wp_logout' );
+
+					return;
+				}
+			}
+		}
+
+		if ( isset( $_REQUEST['fdl'] ) ) {
+			if ( stristr( $_REQUEST['fdl'], '..' ) ) {
+				return;
+			}
+
+			MainWP_Utility::instance()->upload_file( $_REQUEST['fdl'], isset( $_REQUEST['foffset'] ) ? $_REQUEST['foffset'] : 0 );
+			exit;
+		}
+
+		$where = isset( $_REQUEST['where'] ) ? $_REQUEST['where'] : '';
+		if ( isset( $_POST['f'] ) || isset( $_POST['file'] ) ) {
+			$file = '';
+			if ( isset( $_POST['f'] ) ) {
+				$file = $_POST['f'];
+			} elseif ( isset( $_POST['file'] ) ) {
+				$file = $_POST['file'];
+			}
+
+			$where = 'admin.php?page=mainwp_child_tab&tab=restore-clone';
+			if ( '' === session_id() ) {
+				session_start();
+			}
+			$_SESSION['file'] = $file;
+			$_SESSION['size'] = $_POST['size'];
+		}
+
+		// to support open not wp-admin url.
+		$open_location = isset( $_REQUEST['open_location'] ) ? $_REQUEST['open_location'] : '';
+		if ( ! empty( $open_location ) ) {
+			$open_location = base64_decode( $open_location ); // phpcs:ignore WordPress.PHP.DiscouragedPHPFunctions -- base64_encode function is used for begin reasons.
+			$_vars         = MainWP_Helper::parse_query( $open_location );
+			$_path         = wp_parse_url( $open_location, PHP_URL_PATH );
+			if ( isset( $_vars['_mwpNoneName'] ) && isset( $_vars['_mwpNoneValue'] ) ) {
+				$_vars[ $_vars['_mwpNoneName'] ] = wp_create_nonce( $_vars['_mwpNoneValue'] );
+				unset( $_vars['_mwpNoneName'] );
+				unset( $_vars['_mwpNoneValue'] );
+				$open_url = '';
+				foreach ( $_vars as $key => $value ) {
+					$open_url .= $key . '=' . $value . '&';
+				}
+				$open_url      = rtrim( $open_url, '&' );
+				$open_location = '/wp-admin/' . $_path . '?' . $open_url;
+			} else {
+				if ( strpos( $open_location, 'nonce=child_temp_nonce' ) !== false ) {
+					$open_location = str_replace( 'nonce=child_temp_nonce', 'nonce=' . wp_create_nonce( 'wp-ajax' ), $open_location );
+				}
+			}
+			wp_safe_redirect( site_url() . $open_location );
+			exit();
+		}
+
+		wp_safe_redirect( admin_url( $where ) );
+
+		exit();
+	}
+	
+	public function check_login() {
+
+		if ( ! isset( $_POST['mainwpsignature'] ) || empty( $_POST['mainwpsignature'] ) ) {
+			return false;
+		}
+
+		$file = '';
+		if ( isset( $_REQUEST['f'] ) ) {
+			$file = $_REQUEST['f'];
+		} elseif ( isset( $_REQUEST['file'] ) ) {
+			$file = $_REQUEST['file'];
+		} elseif ( isset( $_REQUEST['fdl'] ) ) {
+			$file = $_REQUEST['fdl'];
+		}
+
+		$auth = $this->auth( isset( $_POST['mainwpsignature'] ) ? rawurldecode( $_POST['mainwpsignature'] ) : '', isset( $_POST['function'] ) ? $_POST['function'] : rawurldecode( ( isset( $_REQUEST['where'] ) ? $_REQUEST['where'] : $file ) ), isset( $_POST['nonce'] ) ? $_POST['nonce'] : '', isset( $_POST['nossl'] ) ? $_POST['nossl'] : 0 );
+
+		if ( ! $auth ) {
+			MainWP_Helper::error( __( 'Authentication failed! Please deactivate and re-activate the MainWP Child plugin on this site.', 'mainwp-child' ) );
+		}
+
+		$auth_user = false;
+		if ( $auth ) {
+			// disable duo auth for mainwp.
+			remove_action( 'init', 'duo_verify_auth', 10 );
+
+			// Check if the user exists & is an administrator.
+			if ( isset( $_POST['function'] ) && isset( $_POST['user'] ) ) {
+
+				$user = null;
+
+				if ( isset( $_POST['alt_user'] ) && ! empty( $_POST['alt_user'] ) ) {
+					if ( $this->check_login_as( $_POST['alt_user'] ) ) {
+						$auth_user = $_POST['alt_user'];
+						$user      = get_user_by( 'login', $auth_user );
+					}
+				}
+
+				// if not valid alternative admin.
+				if ( ! $user ) {
+					// check connected admin existed.
+					$user      = get_user_by( 'login', $_POST['user'] );
+					$auth_user = $_POST['user'];
+				}
+
+				if ( ! $user ) {
+					MainWP_Helper::error( __( 'That administrator username was not found on this child site. Please verify that it is an existing administrator.', 'mainwp-child' ) );
+				}
+
+				if ( 10 != $user->wp_user_level && ( ! isset( $user->user_level ) || 10 != $user->user_level ) && ! $user->has_cap( 'level_10' ) ) {
+					MainWP_Helper::error( __( 'That user is not an administrator. Please use an administrator user to establish the connection.', 'mainwp-child' ) );
+				}
+
+				$this->login( $auth_user );
+			}
+
+			if ( isset( $_POST['function'] ) && 'visitPermalink' === $_POST['function'] ) {
+
+				if ( empty( $auth_user ) ) {
+					$auth_user = $_POST['user'];
+				}
+
+				if ( $this->login( $auth_user, true ) ) {
+					return;
+				} else {
+					exit();
+				}
+			}
+
+			// Redirect to the admin part if needed.
+			if ( isset( $_POST['admin'] ) && '1' === $_POST['admin'] ) {
+				wp_safe_redirect( get_option( 'siteurl' ) . '/wp-admin/' );
+				die();
+			}
+		}
+	}
+	
+	/**
+	 * 
+	 * Check to support login by alternative admin.
+	 * Return false will login by connected admin user.
+	 * Return true will try to login as alternative user.
+	 * 
+	 * 
+	 */
+	public function check_login_as( $alter_login ) {
+
+		if ( ! empty( $alter_login ) ) {
+			// check alternative admin existed.
+			$user = get_user_by( 'login', $alter_login );
+
+			if ( ! $user ) {
+				// That administrator username was not found on this child site.
+				return false;
+			}
+
+			if ( 10 != $user->wp_user_level && ( ! isset( $user->user_level ) || 10 != $user->user_level ) && ! $user->has_cap( 'level_10' ) ) {
+				// That user is not an administrator.
+				return false;
+			}
+
+			return true; // ok, will try to login by alternative user.
+		}
+
+		return false;
+	}
+
+	// Login.
+	public function login( $username, $doAction = false ) {
+		global $current_user;
+
+		// Logout if required.
+		if ( isset( $current_user->user_login ) ) {
+			if ( $current_user->user_login === $username ) {
+
+				// to fix issue multi user session.
+				$user_id = wp_validate_auth_cookie();
+				if ( $user_id && $user_id === $current_user->ID ) {
+					return true;
+				}
+
+				wp_set_auth_cookie( $current_user->ID );
+				return true;
+			}
+			do_action( 'wp_logout' );
+		}
+
+		$user = get_user_by( 'login', $username );
+		if ( $user ) {
+			wp_set_current_user( $user->ID );
+			wp_set_auth_cookie( $user->ID );
+			if ( $doAction ) {
+				do_action( 'wp_login', $user->user_login );
+			}
+
+			return ( is_user_logged_in() && $current_user->user_login === $username );
+		}
+
+		return false;
+	}
+	
+	
+	public function check_other_auth() {
+		$auths = get_option( 'mainwp_child_auth' );
+
+		if ( ! $auths ) {
+			$auths = array();
+		}
+
+		if ( ! isset( $auths['last'] ) || $auths['last'] < mktime( 0, 0, 0, date( 'm' ), date( 'd' ), date( 'Y' ) ) ) { // phpcs:ignore -- local time.
+			// Generate code for today.
+			for ( $i = 0; $i < $this->maxHistory; $i ++ ) {
+				if ( ! isset( $auths[ $i + 1 ] ) ) {
+					continue;
+				}
+
+				$auths[ $i ] = $auths[ $i + 1 ];
+			}
+			$newI = $this->maxHistory + 1;
+			while ( isset( $auths[ $newI ] ) ) {
+				unset( $auths[ $newI ++ ] );
+			}
+			$auths[ $this->maxHistory ] = md5( MainWP_Helper::rand_string( 14 ) );
+			$auths['last']              = time();
+			MainWP_Helper::update_option( 'mainwp_child_auth', $auths, 'yes' );
+		}
+	}
+}
diff --git a/class/class-mainwp-helper.php b/class/class-mainwp-helper.php
index cde7d6b..6f7e69f 100644
--- a/class/class-mainwp-helper.php
+++ b/class/class-mainwp-helper.php
@@ -26,7 +26,7 @@ class MainWP_Helper {
 
 	public function write( $val ) {
 		if ( isset( $_REQUEST['json_result'] ) && true == $_REQUEST['json_result'] ) :
-			$output = self::safe_json_encode( $val );
+			$output = wp_json_encode( $val );
 		else :
 			$output = serialize( $val ); // phpcs:ignore -- to compatible.
 		endif;
@@ -34,73 +34,10 @@ class MainWP_Helper {
 		die( '<mainwp>' . base64_encode( $output ) . '</mainwp>' ); // phpcs:ignore WordPress.PHP.DiscouragedPHPFunctions -- to compatible with http encoding.
 	}
 
-	public static function json_valid_check( $data ) {
-
-		if ( is_array( $data ) ) {
-			$output = array();
-			foreach ( $data as $key => $value ) {
-				if ( is_string( $key ) ) {
-					$id = self::json_convert_string( $key );
-				} else {
-					$id = $key;
-				}
-				if ( is_array( $value ) || is_object( $value ) ) {
-					$output[ $id ] = self::json_valid_check( $value );
-				} elseif ( is_string( $value ) ) {
-					$output[ $id ] = self::json_convert_string( $value );
-				} else {
-					$output[ $id ] = $value;
-				}
-			}
-		} elseif ( is_object( $data ) ) {
-			$output = new stdClass();
-			foreach ( $data as $key => $value ) {
-				if ( is_string( $key ) ) {
-					$id = self::json_convert_string( $key );
-				} else {
-					$id = $key;
-				}
-				if ( is_array( $value ) || is_object( $value ) ) {
-					$output->$id = self::json_valid_check( $value );
-				} elseif ( is_string( $value ) ) {
-					$output->$id = self::json_convert_string( $value );
-				} else {
-					$output->$id = $value;
-				}
-			}
-		} elseif ( is_string( $data ) ) {
-			return self::json_convert_string( $data );
-		} else {
-			return $data;
-		}
-
-		return $output;
-	}
-
-	public function json_convert_string( $str ) {
-		if ( function_exists( 'mb_convert_encoding' ) ) {
-			$encoding = mb_detect_encoding( $str, mb_detect_order(), true );
-			if ( $encoding ) {
-				return mb_convert_encoding( $str, 'UTF-8', $encoding );
-			} else {
-				return mb_convert_encoding( $str, 'UTF-8', 'UTF-8' );
-			}
-		}
-		return $str;
-	}
-
-	public static function safe_json_encode( $value, $options = 0, $depth = 512 ) {
-		$encoded = json_encode( $value, $options, $depth );
-		if ( false === $encoded && ! empty( $value ) && JSON_ERROR_UTF8 == json_last_error() ) {
-			$encoded = json_encode( self::json_valid_check( $value ), $options, $depth );
-		}
-		return $encoded;
-	}
-
 	public static function close_connection( $val = null ) {
 
 		if ( isset( $_REQUEST['json_result'] ) && true == $_REQUEST['json_result'] ) :
-			$output = self::safe_json_encode( $val );
+			$output = wp_json_encode( $val );
 		else :
 			$output = serialize( $val ); // phpcs:ignore -- to compatible.
 		endif;
@@ -240,44 +177,10 @@ class MainWP_Helper {
 			$local_img_url  = $upload_dir['url'] . '/' . basename( $local_img_path );
 
 			// to fix issue re-create new attachment.
-			if ( $check_file_existed ) {
-				if ( file_exists( $local_img_path ) ) {
-
-					if ( filesize( $local_img_path ) == filesize( $temporary_file ) ) {
-						$result = self::get_maybe_existed_attached_id( $local_img_url );
-						if ( is_array( $result ) ) {
-							$attach = current( $result );
-							if ( is_object( $attach ) ) {
-								if ( file_exists( $temporary_file ) ) {
-									unlink( $temporary_file );
-								}
-								return array(
-									'id'  => $attach->ID,
-									'url' => $local_img_url,
-								);
-							}
-						}
-					}
-				} else {
-					$result = self::get_maybe_existed_attached_id( $filename, false );
-					if ( is_array( $result ) ) {
-						$attach = current( $result );
-						if ( is_object( $attach ) ) {
-							$basedir        = $upload_dir['basedir'];
-							$baseurl        = $upload_dir['baseurl'];
-							$local_img_path = str_replace( $baseurl, $basedir, $attach->guid );
-							if ( file_exists( $local_img_path ) && ( filesize( $local_img_path ) == filesize( $temporary_file ) ) ) {
-								if ( file_exists( $temporary_file ) ) {
-									unlink( $temporary_file );
-								}
-								return array(
-									'id'  => $attach->ID,
-									'url' => $attach->guid,
-								);
-							}
-						}
-					}
-				}
+			if ( $check_file_existed ) {				
+				$result = self::check_media_file_existed( $upload_dir, $filename, $temporary_file, $local_img_path, $local_img_url );				
+				if ( ! empty( $result ) )
+					return $result;
 			}
 
 			// file exists, do not overwrite, generate unique file name.
@@ -288,42 +191,86 @@ class MainWP_Helper {
 			}
 
 			$moved = rename( $temporary_file, $local_img_path );
-
 			if ( $moved ) {
-				$wp_filetype = wp_check_filetype( basename( $img_url ), null ); // Get the filetype to set the mimetype.
-				$attachment  = array(
-					'post_mime_type' => $wp_filetype['type'],
-					'post_title'     => isset( $img_data['title'] ) && ! empty( $img_data['title'] ) ? $img_data['title'] : preg_replace( '/\.[^.]+$/', '', basename( $img_url ) ),
-					'post_content'   => isset( $img_data['description'] ) && ! empty( $img_data['description'] ) ? $img_data['description'] : '',
-					'post_excerpt'   => isset( $img_data['caption'] ) && ! empty( $img_data['caption'] ) ? $img_data['caption'] : '',
-					'post_status'    => 'inherit',
-					'guid'           => $local_img_url,
-				);
-
-				// for post attachments, thumbnail.
-				if ( $parent_id ) {
-					$attachment['post_parent'] = $parent_id;
-				}
-
-				$attach_id = wp_insert_attachment( $attachment, $local_img_path ); // Insert the image in the database.
-				require_once ABSPATH . 'wp-admin/includes/image.php';
-				$attach_data = wp_generate_attachment_metadata( $attach_id, $local_img_path );
-				wp_update_attachment_metadata( $attach_id, $attach_data ); // Update generated metadata.
-				if ( isset( $img_data['alt'] ) && ! empty( $img_data['alt'] ) ) {
-					update_post_meta( $attach_id, '_wp_attachment_image_alt', $img_data['alt'] );
-				}
-				return array(
-					'id'  => $attach_id,
-					'url' => $local_img_url,
-				);
+				return self::insert_attachment_media( $img_data, $img_url, $parent_id, $local_img_path, $local_img_url );				
 			}
+			
 		}
+		
 		if ( file_exists( $temporary_file ) ) {
 			unlink( $temporary_file );
 		}
-
 		return null;
 	}
+	
+	private static function check_media_file_existed( $upload_dir, $filename, $temporary_file, &$local_img_path, $local_img_url ){		
+		if ( file_exists( $local_img_path ) ) {
+			if ( filesize( $local_img_path ) == filesize( $temporary_file ) ) {
+				$result = self::get_maybe_existed_attached_id( $local_img_url );
+				if ( is_array( $result ) ) {
+					$attach = current( $result );
+					if ( is_object( $attach ) ) {
+						if ( file_exists( $temporary_file ) ) {
+							unlink( $temporary_file );
+						}
+						return array(
+							'id'  => $attach->ID,
+							'url' => $local_img_url,
+						);
+					}
+				}
+			}
+		} else {
+			$result = self::get_maybe_existed_attached_id( $filename, false );
+			if ( is_array( $result ) ) {
+				$attach = current( $result );
+				if ( is_object( $attach ) ) {
+					$basedir        = $upload_dir['basedir'];
+					$baseurl        = $upload_dir['baseurl'];
+					$local_img_path = str_replace( $baseurl, $basedir, $attach->guid );
+					if ( file_exists( $local_img_path ) && ( filesize( $local_img_path ) == filesize( $temporary_file ) ) ) {
+						if ( file_exists( $temporary_file ) ) {
+							unlink( $temporary_file );
+						}
+						return array(
+							'id'  => $attach->ID,
+							'url' => $attach->guid,
+						);
+					}
+				}
+			}
+		}
+	}
+	
+	private static function insert_attachment_media( $img_data, $img_url, $parent_id, $local_img_path, $local_img_url ){		
+		
+		$wp_filetype = wp_check_filetype( basename( $img_url ), null ); // Get the filetype to set the mimetype.
+		$attachment  = array(
+			'post_mime_type' => $wp_filetype['type'],
+			'post_title'     => isset( $img_data['title'] ) && ! empty( $img_data['title'] ) ? $img_data['title'] : preg_replace( '/\.[^.]+$/', '', basename( $img_url ) ),
+			'post_content'   => isset( $img_data['description'] ) && ! empty( $img_data['description'] ) ? $img_data['description'] : '',
+			'post_excerpt'   => isset( $img_data['caption'] ) && ! empty( $img_data['caption'] ) ? $img_data['caption'] : '',
+			'post_status'    => 'inherit',
+			'guid'           => $local_img_url,
+		);
+
+		// for post attachments, thumbnail.
+		if ( $parent_id ) {
+			$attachment['post_parent'] = $parent_id;
+		}
+
+		$attach_id = wp_insert_attachment( $attachment, $local_img_path ); // Insert the image in the database.
+		require_once ABSPATH . 'wp-admin/includes/image.php';
+		$attach_data = wp_generate_attachment_metadata( $attach_id, $local_img_path );
+		wp_update_attachment_metadata( $attach_id, $attach_data ); // Update generated metadata.
+		if ( isset( $img_data['alt'] ) && ! empty( $img_data['alt'] ) ) {
+			update_post_meta( $attach_id, '_wp_attachment_image_alt', $img_data['alt'] );
+		}
+		return array(
+			'id'  => $attach_id,
+			'url' => $local_img_url,
+		);
+	}
 
 	public static function get_maybe_existed_attached_id( $filename, $full_guid = true ) {
 		global $wpdb;
@@ -333,47 +280,6 @@ class MainWP_Helper {
 		return $wpdb->get_results( $wpdb->prepare( "SELECT ID,guid FROM $wpdb->posts WHERE post_type = 'attachment' AND guid LIKE %s", '%/' . $wpdb->esc_like( $filename ) ) );
 	}
 
-	public static function upload_file( $file_url, $path, $file_name ) {
-		// to fix uploader extension rename htaccess file issue.
-		if ( '.htaccess' != $file_name && '.htpasswd' != $file_name ) {
-			$file_name = sanitize_file_name( $file_name );
-		}
-
-		$full_file_name = $path . DIRECTORY_SEPARATOR . $file_name;
-
-		$response = wp_remote_get(
-			$file_url,
-			array(
-				'timeout'  => 10 * 60 * 60,
-				'stream'   => true,
-				'filename' => $full_file_name,
-			)
-		);
-
-		if ( is_wp_error( $response ) ) {
-			unlink( $full_file_name );
-			throw new \Exception( 'Error: ' . $response->get_error_message() );
-		}
-
-		if ( 200 !== (int) wp_remote_retrieve_response_code( $response ) ) {
-			unlink( $full_file_name );
-			throw new \Exception( 'Error 404: ' . trim( wp_remote_retrieve_response_message( $response ) ) );
-		}
-		if ( '.phpfile.txt' === substr( $file_name, - 12 ) ) {
-			$new_file_name = substr( $file_name, 0, - 12 ) . '.php';
-			$new_file_name = $path . DIRECTORY_SEPARATOR . $new_file_name;
-			$moved         = rename( $full_file_name, $new_file_name );
-			if ( $moved ) {
-				return array( 'path' => $new_file_name );
-			} else {
-				unlink( $full_file_name );
-				throw new \Exception( 'Error: Copy file.' );
-			}
-		}
-
-		return array( 'path' => $full_file_name );
-	}
-
 	public static function get_mainwp_dir( $what = null, $dieOnError = true ) {
 		$upload_dir = wp_upload_dir();
 		$dir        = $upload_dir['basedir'] . DIRECTORY_SEPARATOR . 'mainwp' . DIRECTORY_SEPARATOR;
diff --git a/class/class-mainwp-keyword-links.php b/class/class-mainwp-keyword-links.php
index deef3ad..a1202da 100644
--- a/class/class-mainwp-keyword-links.php
+++ b/class/class-mainwp-keyword-links.php
@@ -68,6 +68,18 @@ class MainWP_Keyword_Links {
 			$this->update_htaccess( true ); // force update
 		}
 	}
+	
+	public function parse_init_keyword_links() {
+		if ( 1 === (int) get_option( 'mainwpKeywordLinks' ) ) {			
+			if ( ! is_admin() ) {
+				add_filter( 'the_content', array( $this, 'filter_content' ), 100 );
+			}
+			$this->update_htaccess();
+			$this->redirect_cloak();
+		} elseif ( 'yes' === get_option( 'mainwp_keyword_links_htaccess_set' ) ) {
+			$this->clear_htaccess();
+		}
+	}
 
 	function mod_rewrite_rules( $pRules ) {
 		$home_root = parse_url( home_url() );
@@ -776,17 +788,13 @@ class MainWP_Keyword_Links {
 		}
 	}
 
-	public function enable_stats() {
-		global $mainWPChild;
-		$result       = array();
+	public function enable_stats() {				
 		$enable_stats = intval( $_POST['enablestats'] );
 		if ( get_option( 'mainwp_kwl_enable_statistic' ) !== $enable_stats ) {
 			if ( MainWP_Helper::update_option( 'mainwp_kwl_enable_statistic', $enable_stats ) ) {
 				$return['status'] = 'SUCCESS';
-			}
-			$mainWPChild->update_htaccess( true );
+			}			
 		}
-
 		return $return;
 	}
 
diff --git a/class/class-mainwp-utility.php b/class/class-mainwp-utility.php
new file mode 100644
index 0000000..fc54903
--- /dev/null
+++ b/class/class-mainwp-utility.php
@@ -0,0 +1,213 @@
+<?php
+
+namespace MainWP\Child;
+
+// phpcs:disable WordPress.WP.AlternativeFunctions -- to custom.
+
+class MainWP_Utility {
+	
+	public static $instance = null;
+
+	/**
+	 * Method get_class_name()
+	 *
+	 * Get Class Name.
+	 *
+	 * @return object
+	 */
+	public static function get_class_name() {
+		return __CLASS__;
+	}
+
+	public static function instance() {
+		if ( null === self::$instance ) {
+			self::$instance = new self();
+		}
+		return self::$instance;
+	}
+	
+	
+	public function run_saved_snippets() {
+		
+		if ( isset( $_POST['action'] ) && isset( $_POST['mainwpsignature'] ) ) {
+			$action = $_POST['action'];			
+			if ( 'run_snippet' === $action || 'save_snippet' === $action || 'delete_snippet' === $action ) {
+				return;  // do not run saved snippets if in do action snippet.
+			}
+		}
+
+		if ( get_option( 'mainwp_ext_snippets_enabled' ) ) {
+			$snippets = get_option( 'mainwp_ext_code_snippets' );
+			if ( is_array( $snippets ) && count( $snippets ) > 0 ) {
+				foreach ( $snippets as $code ) {
+					MainWP_Helper::execute_snippet( $code );
+				}
+			}
+		}
+	}
+	
+	public static function fix_for_custom_themes() {
+		if ( file_exists( ABSPATH . '/wp-admin/includes/screen.php' ) ) {
+			include_once ABSPATH . '/wp-admin/includes/screen.php';
+		}
+		if ( function_exists( 'et_register_updates_component' ) ) {
+			et_register_updates_component();
+		}
+	}
+	
+	/**
+	 * 
+	 * To support maintenance alert
+	 * 	 
+	 */	
+	public function maintenance_alert() {
+		if ( ! is_404() ) {
+			return;
+		}
+
+		if ( 1 !== (int) get_option( 'mainwp_maintenance_opt_alert_404' ) ) {
+			return;
+		}
+
+		$email = get_option( 'mainwp_maintenance_opt_alert_404_email' );
+
+		if ( empty( $email ) || ! preg_match( '/^[a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+\.[a-zA-Z0-9-.]+$/is', $email ) ) {
+			return;
+		}
+
+		// set status.
+		header( 'HTTP/1.1 404 Not Found' );
+		header( 'Status: 404 Not Found' );
+
+		// site info.
+		$blog       = get_bloginfo( 'name' );
+		$site       = get_bloginfo( 'url' ) . '/';
+		$from_email = get_bloginfo( 'admin_email' );
+
+		// referrer.
+		if ( isset( $_SERVER['HTTP_REFERER'] ) ) {
+			$referer = MainWP_Helper::clean( $_SERVER['HTTP_REFERER'] );
+		} else {
+			$referer = 'undefined';
+		}
+		$protocol = isset( $_SERVER['HTTPS'] ) && strcasecmp( $_SERVER['HTTPS'], 'off' ) ? 'https://' : 'http://';
+		// request URI.
+		if ( isset( $_SERVER['REQUEST_URI'] ) && isset( $_SERVER['HTTP_HOST'] ) ) {
+			$request = MainWP_Helper::clean( $protocol . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'] );
+		} else {
+			$request = 'undefined';
+		}
+		// query string.
+		if ( isset( $_SERVER['QUERY_STRING'] ) ) {
+			$string = MainWP_Helper::clean( $_SERVER['QUERY_STRING'] );
+		} else {
+			$string = 'undefined';
+		}
+		// IP address.
+		if ( isset( $_SERVER['REMOTE_ADDR'] ) ) {
+			$address = MainWP_Helper::clean( $_SERVER['REMOTE_ADDR'] );
+		} else {
+			$address = 'undefined';
+		}
+		// user agent.
+		if ( isset( $_SERVER['HTTP_USER_AGENT'] ) ) {
+			$agent = MainWP_Helper::clean( $_SERVER['HTTP_USER_AGENT'] );
+		} else {
+			$agent = 'undefined';
+		}
+		// identity.
+		if ( isset( $_SERVER['REMOTE_IDENT'] ) ) {
+			$remote = MainWP_Helper::clean( $_SERVER['REMOTE_IDENT'] );
+		} else {
+			$remote = 'undefined';
+		}
+		// log time.
+		$time = MainWP_Helper::clean( date( 'F jS Y, h:ia', time() ) ); // phpcs:ignore -- local time.
+
+		$mail = '<div>404 alert</div><div></div>' .
+				'<div>TIME: ' . $time . '</div>' .
+				'<div>*404: ' . $request . '</div>' .
+				'<div>SITE: ' . $site . '</div>' .
+				'<div>REFERRER: ' . $referer . '</div>' .
+				'<div>QUERY STRING: ' . $string . '</div>' .
+				'<div>REMOTE ADDRESS: ' . $address . '</div>' .
+				'<div>REMOTE IDENTITY: ' . $remote . '</div>' .
+				'<div>USER AGENT: ' . $agent . '</div>';
+		wp_mail(
+			$email,
+			'MainWP - 404 Alert: ' . $blog,
+			MainWP_Helper::format_email( $email, $mail ),
+			array(
+				'content-type: text/html',
+			)
+		);
+	}
+	
+	public function cron_active() {
+		if ( ! defined( 'DOING_CRON' ) || ! DOING_CRON ) {
+			return;
+		}
+		if ( empty( $_GET['mainwp_child_run'] ) || 'test' !== $_GET['mainwp_child_run'] ) {
+			return;
+		}
+		session_write_close();
+		header( 'Content-Type: text/html; charset=' . get_bloginfo( 'charset' ), true );
+		header( 'X-Robots-Tag: noindex, nofollow', true );
+		header( 'X-MainWP-Child-Version: ' . MainWP_Child::$version, true );
+		nocache_headers();
+		if ( 'test' == $_GET['mainwp_child_run'] ) {
+			die( 'MainWP Test' );
+		}
+		die( '' );
+	}
+	
+	
+	/**
+	 * 
+	 * To support upload backup files.
+	 * 
+	 */
+	public function upload_file( $file, $offset = 0 ) {
+		$dirs      = MainWP_Helper::get_mainwp_dir( 'backup' );
+		$backupdir = $dirs[0];
+
+		header( 'Content-Description: File Transfer' );
+
+		header( 'Content-Description: File Transfer' );
+		if ( MainWP_Helper::ends_with( $file, '.tar.gz' ) ) {
+			header( 'Content-Type: application/x-gzip' );
+			header( 'Content-Encoding: gzip' );
+		} else {
+			header( 'Content-Type: application/octet-stream' );
+		}
+		header( 'Content-Disposition: attachment; filename="' . basename( $file ) . '"' );
+		header( 'Expires: 0' );
+		header( 'Cache-Control: must-revalidate' );
+		header( 'Pragma: public' );
+		header( 'Content-Length: ' . filesize( $backupdir . $file ) );
+		while ( ob_end_flush() ) {; // phpcs:ignore
+		}
+		$this->readfile_chunked( $backupdir . $file, $offset );
+	}
+
+	public function readfile_chunked( $filename, $offset ) {
+		$chunksize = 1024; // how many bytes per chunk?
+		$handle    = fopen( $filename, 'rb' );
+		if ( false === $handle ) {
+			return false;
+		}
+
+		fseek( $handle, $offset );
+
+		while ( ! feof( $handle ) ) {
+			$buffer = fread( $handle, $chunksize );
+			echo $buffer;
+			ob_flush();
+			flush();
+			$buffer = null;
+		}
+
+		return fclose( $handle );
+	}
+	
+}