Thanks, TMC and D-Dub, but no joy. I'm running it from the download version. It did have the deactivate links, but says it can't do it, and have found no way around that. I deleted the program, and ran a cleaner. Then made sure any background programs where shut down. Did a new install, to a new directory. Got same 'Can't write licensing data' message as before.

Anything else I might try?

Thanks again.