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. Go to Dashboard -> Updates and click on Check Again.
5. Try to update the theme via Appearance -> Themes or via Dashboard -> Updates.
Please always make a backup before the update, new plugins, or any testing.
Check this how to update the theme: https://xtemos.com/docs-topic/update-the-theme
If the issue remains, share the valid login details of your site so I can update the latest version of the theme on your site.
Best Regards,