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the game will not let me activate the same product key I unlocked with. It is as if the product key stopped working. I do not understand how this could happen. I was able to use the game fine for over a month and now when I launched it today it asked me to unlock full version if it was already unlocked.
I am not from Laminar Research; just a flight simmer from downunder.
Normally when a download version is upgraded it does not cause or create a problem you describe. When you run a DVD version you have to have disc 1 in a DVD drive at all times. When you run a digital download version you have to be connected to the internet at all times. Whether you run a dvd version or digital download version the software performs a silent check to determine if you are running a legal copy or running two versions at the same time.
There are many others who have experienced the same problem as you.
To the best of my knowledge the only legal digital download version available is from Laminar Research. Any other sellers are most likely selling a "dodgy" or pirate copy. Where did you purchase your copy from?
If you purchased from g2a then it is 99.9% confirmed it is a pirate copy. Have a look at all of the problems listed under this link found at https://questions.x-plane.com/search?q=g2a
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