I tried to "open as admin", but it still requested the keys. When I entered them and clicked ok, the program opened, along with the Bu Tel purchase page in my browser, and the program menu options of setup, tools, and help are the only functioning options. All others are greyed out. I have had a couple of lengthy Win10 updates recently...
I just restarted the program again (third time), without "Open as Admin", and this time it opened fully. Go Figure.