Mod help

Im trying to install some cosmetic and audio mods to haloify my helldivers experience. I had the mod tool installed but whenever I tried to set the storage directory stuff up it gives me a red message saying I need to purge before changing the location. Purging does nothing to fix it. Im not very good at tech stuff so im probably just putting something in the wrong file. But if someone could hop in discord I could share my screen. Any help would be greatly appreciated.