I have CS6 registered for two computers.
I tried to do a clean install on one of them, after first deregistering that computer.
I can’t fill in my registration number because it never gets that far.
How do I fix this?
You'll need to run the cleaner tool (and wipe out all things CS6), and if you also have a cloud subscription you'll need to jump through hoops to fool the installer into thinking you don't.
Thanks very much for your help. I will try this. I don't have a CC subscription because I don't really use any of it apart from Photoshop and InDesign only very infrequently.