My subscription for Parallels just expired. I am currently on 12. I used the upgrade option from the Parallels website to upgrade: Cleverbridge inc - Parallels Desktop for Mac Pro Edition Upgrade (1 Year) - #119767747 When I try to activate the new key, I'm asked to provide the previous key as this is an upgrade key. I provide the previous key. Both have green ticks against them. When I click Activate, I get this error: Unable to activate Parallels Desktop. The product key of a previous version of Parallels Desktop has been not accepted on the license server. I'm locked out of my VM and my work. Please help.