What do you mean? if it is activated?
Usually, when you buy themes on Themeforest, a license is obtained, that is, a license code that needs to be entered to activate and enable all the resources and features (regular updates) of the same theme. so an excellent question is how that part works. (you probably know what balotelli wanted to ask)
For example, I need these themes https://themeforest.net/item/mylisting-directory-listing-wordpress-theme/20593226 probably for two or even three different domains. So, let me explain how things going on here in this case.
Just to mention, I already have this theme from a similar service offer like yours, but it's not updateable and now it's going to be useless since I haven't the latest updates which brings me certain limitations, eg support for updating to the new PHP 7.4+.