I selected NO to all products except GSX. But after a new start it happens again.
Well, of course it happens again. If you said NO, it's normal it would ask again at the next restart. The reason of the question, it's because you have a Serial Number in the registry for that scenery, but you haven't activated yet.
So, if you have a Serial Number in the registry for that scenery, it's likely you want to activate it so, the most logical answer is to reply YES to the activation request.