I tried both ways:
first I used default installation (to my desktop) and X-Plane 11 was created. Within the folder I tried to run x-plane 11.exe -> didn't run and was given that message
second I installed it in another drive (my F:/). I tried to run it from inside this F:/X-Plane 11/x-plane 11.exe with the same result and same message. I then sent a shortcut from this installation folder to my desktop and it didn't run too, same result, same message.
tks for answering