Here’s a nice simple, yet frustrating one!   If you go through the Windows Anytime Upgrade site, make a purchase, get a key (so far so good) and then the key doesn’t work?!

You just get the error “Enter a different key”  and then  “The upgrade key you entered is for an edition of Windows that does not work with Windows Anytime Upgrade”

 

anytime_error

The fix?  Simple, reboot and the upgrade will continue automatically!