The problem may be the activation process. When the error window pops up leave it open and go down to Cortana and type in troubleshooting. When you run the troubleshooter the activation window should open. Put your numbers in and everything should be good.
Be sure PartMgr has P and M capiltalized - Windows 10 and Accleration.
Window 10 and Flight Simulator Acceleration
in Newcomer Services
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Be sure PartMgr has P and M capiltalized - Windows 10 and Accleration.