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Please see the official X‑Plane Support page for help.
I'm trying to get X-Plane 11 Demo before buying it, so I downloaded the installer then run it with default and no-default installation folder (1st at C:\...\users\...\desktop) (2nd at F:\X-Plane 11). I de-activated my spyware program. Everything seems ok during installation process but then:
Either installations show the same warning.
Have you tried opening the folder where you installed X-Plane 11 to and running the executable file straight from there ('x-plane.exe' for Windows)? It sound likes rather than creating a shortcut, you've possibly made a copy of this .exe file and you're attempting to run it from outside the X-Plane folder.
This site is no longer being actively maintained.