When purchasing a theme today, we support Drupal 11.2 and later. We provide "best effort" support for earlier versions of Drupal including Drupal 10.
If you are on Drupal 10, you'll want to make sure you're on 10.5 or later to ensure stylesheets are loaded in the correct order (Drupal change record here). You'll also want to the ui_icons_backport (part of UI Icons) to handle the icon functionality. And included recipes will not work.