Hi James, The premium zip file is a plugin that adds functionality to the theme.
So you add it as a new plugin rather than a theme.
Then you will be fine!
HTH, Dave
You will find that way of adding extra functionality to a theme is very common – once installed that is it, nothing more to do – enter your registration code and updates will be allowed.
Dave
The GeneratePress theme is free to download, install and use.
By paying for the premium add on you are getting the extra features.
It’s as simple as that! Nothing to do with other themes, just GeneratePress.
What you get extra is explained on this page: https://generatepress.com/premium/
Dave
GeneratePress is the free theme that is available on the WordPress repository.
GeneratePress Premium is a plugin that extends the features of ( and only of ) the free GeneratePress theme.