I have to re-install the Launcher in order to play the game.
What do you mean by "have to re-install"?
Does file MBIILauncher.exe disappear from "Jedi Academy\GameData" folder, or did you mean something else?
Please do not speak using phrasing like "does not work", "have to-reinstall", etc. Speak in terms of filenames, exact text of error messages, detailed description of actions you performed.
GameData folder an open the .exe
What file you're trying to launch? MBIILauncher.exe? mbii.x86.exe? jamp.exe?
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Anyway, even if you start Movie battles not using the Launcher, in some other way, you still have to keep Launcher running in background all the time, because of anti-cheating system.