I had Parallels Desktop 9 until today running windows 8. I installed Parallels 11 with Windows 8 then attempted to upgrade to Windows 10 by right-clicking on the VM icon and selecting the upgrade option. Now in the setup it's requiring the product key for windows 10, saying "Windows isn't actived on this PC". When I enter my Windows 8 product key, it doesn't recognize it. Halp???? While I'm at it, I noticed three immediate differences with Parallels 11 compared to 9. First, on 9 when I opened Parallels there was just the one parallels icon on the dock and windows would load. With 11, there's a second icon, Windows 8, next to the Parallels icon. Second, the control panel. And finally, when windows opens it loads on the start page, but for the life of me I can't get to the desktop. If i click on desktop or on escape, it goes to my mac. How do I make it go back to the previous setup?
Err, find the answer myself Posting it in case someone else runs into the same problems. I was in coherence mode, so had to come out of that and voila, desktop appeared (right click on VM, under view). As for the upgrade, seems during installation the product key was not registered. I went to settings > PC Info > at the bottom is the activation information. It said it wasn't activated, so I just entered the product key again. Downloading WIndows 10 once more and hopefully it'll be good to go.