Hmm.. I have a vm with W10 Pro x64, I've just installed RC3 inside and it does the same thing.. once you click it, you have it
I've deleted the registry keys and now it shows unchecked, but if I check it again, it's the same. This vm is quite clean,
does not have anything installed.
I've uninstalled RC3, deleted reg keys and installed v9, same behaviour.
If there's more I can do, just say, I still have a couple of days off 'till my vacation expires