Just wanted to give people a heads-up and get this in the forums in case I can help anyone else.
I recently built a new PC and downloaded all the Topaz stuff. When I went to open them for the first time, I of course had to enter email and password to prove ownership.
Well, some products registered fine, others got various errors.
The issue was my NordVPN. I had to turn it off, and the products that previously did not register then registered fine.