Once you run the installer it is copied to your game folder (make sure it is the right one) then it will install automatically and you're ready to play. And yes the mod will always be active. The game doesn't have a mod folder so the only way to mod this game is to overwrite the files of the vanilla game. If you want to play the original game, you have to reinstall the enitire game (you can also use repair, but that is basically the same thing)
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