Invalid License: Contact Vendor

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in the last days I had massive problems with X Plane 11 and Windows 10, so I had to reinstall X Plane 11 several times which was no improvement and I had to reinstall the operating system completely in the end.

Now I have the problem that when I start GTN 750 the message appears: Invalid License: Contact Vendor
In the forum, hints are given on how to solve the problem. But no improvement.

I hope you can help me.

Many thanks and best regards

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