Allow "Package" downloads. Multiple file downloads using the same license.

custom_edd_sl_license_response

/**
 * This code requires one additional filter param to be added to edd_sl_license_response in EDD_Software_Licensing.php:
 * $response = apply_filters( 'edd_sl_license_response', $params, $download, $data)
 */

/**
 * Allows EDD to bypass the name check for files
 */
define( 'EDD_BYPASS_NAME_CHECK', true );

/**
 * This allows for automatic updates if there is a single
 * product with multiple files that also have their own seperate single downloads.
 */
function custom_edd_sl_license_response( $response, $download, $data ) {

	$item_name = isset( $data['item_name'] ) ? sanitize_text_field( rawurldecode( $data['item_name'] ) ) : false;

	// Check if the license is tied to the product titled "Theme Package"
	if ( 'Theme Package' == $download->post_title ) {

		$switch = get_page_by_title( $item_name, 'OBJECT', 'download' );

		// Fire up the EDD Software Licensing Class
		$SL = new EDD_Software_Licensing();

		$file = $SL->get_encoded_download_package_url( $switch->ID );
		$description = ! empty( $switch->post_excerpt ) ? $switch->post_excerpt : $switch->post_content;
		$changelog   = get_post_meta( $switch->ID, '_edd_sl_changelog', true );

		// Alter JSON response
		$response['new_version'] = $SL->get_download_version( $switch->ID );
		$response['url'] = add_query_arg( 'changelog', '1', get_permalink( $switch->ID ) );
		$response['homepage'] = get_permalink( $switch->ID );
		$response['package'] = $file;
		$response['download_link'] = $file;
		$response['sections'] = serialize( array(
			'description' => wpautop( strip_tags( $description, '<p><li><ul><ol><strong><a><em><span><br>' ) ),
			'changelog'   => wpautop( strip_tags( stripslashes( $changelog ), '<p><li><ul><ol><strong><a><em><span><br>' ) )
		) );

	}

	return $response;
}
add_filter( 'edd_sl_license_response', 'custom_edd_sl_license_response', 10, 3 );