public static function deactivate() {
		// Remove Papi from plugins_loaded action.
		remove_action( 'plugins_loaded', 'papi' );

		// Load deactivate_plugins if it don't exists.
		if ( ! function_exists( 'deactivate_plugins' ) ) {
			include_once ABSPATH . 'wp-admin/includes/plugin.php';
		}

		deactivate_plugins( PAPI_PLUGIN_BASENAME );

		wp_die( esc_html__( 'WordPress 4.6 and higher required to run Papi! The plugin has now disabled itself.', 'papi' ) );

		// Remove instance.
		self::$instance = null;
	}