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Suddenly need activation code for J41 Hawker

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Hi everyone, 

So far I could fly the J41 without any problem on the PC I write this message.  I did not change anything in my PC but now, a popup dialogbox says that  I need an activation code and I don't know where I can get it from. The key I received for the first installation does not work. Strange indeed. For any help I would be very thankful.


Best regards

Alfred Gruetzner

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