Hello,
Thank you very much for choosing our theme and for contacting us.
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.
If the issue remains, make the full backup of your site and update via FTP
https://xtemos.com/docs/woodmart/update-theme-2/
If you have any questions feel free to contact us.
Best Regards.