how to solve：the license server did not accept the product key of the earlier version of Parallels D

V

Vxiao

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I purchased Parallels Desktop 12 in 2017/05/10, then buy Upgrade to Parallels Desktop 16 in 2020/12/15.
recently, I want Move Parallels Desktop to a new Mac，When I filled in two registration codes, its prompted:
Unable to activate Parallels Desktop: the license server did not accept the product key of the earlier version of Parallels Desktop
how to sovle this problem?
 
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