Symptoms
I was using a trial copy of Parallels Desktop, then purchased an upgrade, but can't activate it, as I don't have a license for the previous version required during the activation process.
Cause
Upgrade from a trial copy is not supported. You need a full Parallels Desktop license after using a trial copy.
Resolution
Contact the seller for a return and place an order for a full license at the Parallels Online Store.
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