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Parallels User
Plus, have you even tried my proposed, possible solution? Maybe that's all you need to do. Back up Windows 10 on whichever side it's activated, wipe the partition, reinstall Windows 7/8x, reboot into the other side (if Win10 was activated natively, boot to the VM. If Win10 was activated in the VM, boot natively), activate Windows 7/8x, perform all updates, then run the Windows 10 upgrade. If that works, restore your backed up Win10 install. Try it. It may work and get around this issue. It is a *REAL* pain in the keester, but if it works, it only has to be done once. If it doesn't, that's just more proof that Microsoft really screwed this up bad here.
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