I purchased Parallels version 7 in 2012 and upgraded to 9. I uninstalled it but now have purchased Parallels 12 for running with Sierra. When I try to activate my new version - it asks for the original license key since version 12 is an upgrade. I got the key from the Parallels web site for the original full install, but it keeps saying I've entered an upgrade key and it needs a key from a previous license. I have tried the key I have for versions 7, 8 and 9 but none work and the message is the same. HELP!