Hi r.nemcovsky,

Thanks for reaching to us.

Actually, this issue mostly occurs because of the Max Upload Size Limit on Site from the Server-End. It is usually by default set to 1 or 2MB, so please ask your Hosting Provider to increase your Max Upload Size limit.
https://www.wpbeginner.com/wp-tutorials/how-to-fix-the-link-you-followed-has-expired-error-in-wordpress/

Further, regarding knowing the Requirements of the WoodMart Theme, you can check out the following Documentation Guide:
https://xtemos.com/docs-topic/requirements-wordpress-set-up/

Regards,