Windows 10: Microsoft Flight Simulator Gold edition - Says "Invalid Product Key"

Hi, I have a Microsoft Flight Simulator Gold edition. I am trying to activate the product after installing it on my PC however the message says "Invalid Product Key" . This has never happened before as I have this boxed edition for almost 7-10 years. What Can i Do now?

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Microsoft Flight Simulator x Gold Edition invalid product key

Hi i bought Flight Simulator gold Edition and the product key is invalid i know i typed the right product key and still says invalid product key!

 

Product key for Flight Simulator X Gold Edition

Dear Msr, and Gentleman,

I had since 5 years ago the flight simulator x gold edition in my PC but i had problem before 10 days in my PC and i did the format and I lose the flight simulator but I install it again from the 2 disk i had it but i didn't find the
product key in the cover of the disk and I had bought many products from the just flight and I had registered in the
fsx and Microsoft .

Can you help me to find the product key on my disk of the fsx what I have?

***Original title: The production key***

 

Microsoft flight simulator x gold edition says it's a demo it's not.

why is it when i download Microsoft flight simulator x gold edition after i have played it foe 10 minutes it has a box that pops up says thank you for running the demo it has run out of time how can this be when i installed it off the disc and into my pc withe the product key tell me what's going on?