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Install Key Not Valid Message

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I tried to reinstall FSUIPC4 multiple times and it does install in P3D v3. However, when I try to register it I get a message saying that my "12-digit key code is not valid"??
Yes, I am entering the code properly (copy and paste method). The purchase was made at Simmarket, Order # 1237349. I can supply the rejected key code as necessary. Can you help? 
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