public function __construct( $class_name ) {
		// We need plugin.php!
		require_once( ABSPATH . 'wp-admin/includes/plugin.php' );

		// Validate extension class is valid.
		if ( in_array( false, array(
			class_exists( $class_name ),
			property_exists( $class_name, 'NAME' ),
			property_exists( $class_name, 'REQUIRED_CORE_VER' ),
			method_exists( $class_name, 'instance' ),
		) ) ) {
			return;
		}

		$this->extension_class_name  = $class_name;
		$this->extension_id          = $this->get_static_prop( $class_name, 'ID' );
		$this->extension_wp_repo     = $this->get_static_prop( $class_name, 'WP_REPO' );
		$this->extension_name        = $this->get_static_prop( $class_name, 'NAME' );
		$this->extension_version     = $this->get_static_prop( $class_name, 'VER' );
		$this->required_core_version = $this->get_static_prop( $class_name, 'REQUIRED_CORE_VER' );

		$popup_maker_data = get_plugin_data( WP_PLUGIN_DIR . '/popup-maker/popup-maker.php', false, false );

		if ( $popup_maker_data['Name'] == 'Popup Maker' ) {
			$this->core_installed = true;
			$this->core_path      = 'popup-maker/popup-maker.php';
		}
	}