apply_filters( 'upgrader_pre_download', false|string|WP_Error $reply, string $package, WP_Upgrader $upgrader, array $hook_extra )

316		 * @param false|string|WP_Error $reply      Whether to short-circuit the download, the path to the downloaded package,317		 *                                          or a WP_Error object. Default false.318		 * @param string                $package    The package URI. May be a remote URL or local file path.319		 * @param WP_Upgrader           $upgrader   The WP_Upgrader instance.320		 * @param array                 $hook_extra Extra arguments passed to hooked filters.321		 */322		$reply = apply_filters( 'upgrader_pre_download', false, $package, $this, $hook_extra );323		if ( false !== $reply ) {324			return $reply;325		}326 327		if ( ! preg_match( '!^(http|https|ftp)://!i', $package ) && file_exists( $package ) ) { // Local file or remote?328			return $package; // Must be a local file.