Hi Maria,
I bought the upgrade version with the Black Friday offer and I am trying to activate it. I got the Version 15 Upgrade key and the Parallels 10 activation key, but I get an error like:
"This key cannot be used to activate Parallels Desktop. If this is a key for Parallels Desktop Business Edition, please follow
these instructions or contact your system administrator."
The Version 10 key is not a business edition key.
I am not sure if it the issue is related with the account I used. With version 10 I used my email and now I used the apple ID and created a new account with the version 15 upgrade key. I know it sounds somehow stupid now, but I couldn't see any option to unregister the key from the new account to try it again with my old account.
Please advise