Hello,
Try to do the following to update the theme:
1. Go to Dashboard -> WoodMart -> Theme License and deactivate the theme.
2. Go to Dashboard -> Updates and click on Check Again.
3. Activate the theme with your purchase code again.
4. Try to update the theme via Appearance -> Themes or via Dashboard -> Updates.
If it does not help, make the full backup of your site and update via FTP https://xtemos.com/docs/woodmart/update-theme-2/
If still you are unable to update it, then take the complete backup of your site and share your site WP Admin and FTP Login credentials into private area of this topic, so that I’ll update it for you.
Best Regards.