Here’s a way to make a so called hard-mod 2 mods its possible? - #3 by tqFan (also allows running a 2nd mod on top of your 1st mod)
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you don’t run it from Custom Game but launch the game with a /basemod flag (from Steam setting or shortcut) which makes the mod being applied to your Normal game
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you could technically mod game files directly but this is not clean and files are overwritten with Steam updates and this method avoids that and separates the files