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Thanks for the quick responding. Today I got the message when I was on approach after a 1,5 hour flight. But I also once received the message after 20 minutes. So it is very randomly. I do have a valid digital download key from Laminar, sometimes X-Plane also asks at startup for a serial and when I fill it in I have had no problems. But when it does not asks at the startup then I am afraid the error message will come during flight like today...
Here is the log file:
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