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 you need help, then provide permission and give ftp details, I will update the theme on your site.

Best Regards