Themler supports WordPress 5.3 starting with 493 Beta release. It is strongly recommended to update Themler theme first before updating WordPress Core to version 5.3.
Those users, who have updated WordPress to v 5.3 and encountered error with Themler themes, need to open these themes with Themler Desktop, update to v 493 and re-export to WP. If there is no copy of the theme on the local drive, it is possible to get it from the server where your site is. For this access your site via FTP, open wp-content/themes folder, zip the folder of the required theme and open it with Themler Desktop.
Themler Support Team
Last edited 3 weeks ago by Support Team