All of the web-based menus work okay in Clip Studio 4, but they get *really* wonky in Clip Studio 5. I dunno why so much of this app is built with embedded Edge browser windows, it's such an odd choice. It seems like the best approach is to install Clip Studio 4, activate it, then update to 5. I would say the headache of getting it work compounded by it behaving strangely when it's installed makes it probably not worth it.
It's so frustrating because the app works mostly fine, it's just all the Edge stuff that breaks it.