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Please see the official X‑Plane Support page for help.
I am not from Laminar Research; just a flight simmer from down under.
Have a look at the second part of my answer to a question like yours found at https://questions.x-plane.com/24154/difference-of-the-demo-and-the-full-game
If you are considering Steam then take into account the first part of my answer.
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