Just upgrades to Parallels 11, no problems. I have one VM running Windows 7. How to I add Windows 10 to a second VM so I can choose between Win7 ans Win10? Thanks much for any help.
@Jim31 Please open Parallels Desktop and launch Control Center from Parallels icon from the Mac menu bar. Afterwards, you will be able add new Windows Virtual Machine by clicking the Add button (+).
The "free upgrade" way to do it would be to create a clone of your Win7 VM in Parallels then download the Win10 iso and run the update and select save nothing to get a clean install.