Hi, and welcome!
What did you set in compatibility mode? And what are you clicking to launch the game? Is it possible you set the wrong file in compatibility mode? (It sounds to me like the game is trying to launch with launcher.exe - is that the file you set in compatibility mode?)
You could try going into the game folder and putting any .exe file in there in compatibility mode. Also try launching the game from the start menu (if you haven't already) or from the game's .exe in the TLJ folder (if you haven't tried that already).
-emily
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