Did you create the 'Mods' folder in AppData\LocalLow\Glitch Pitch\Idol Manager? It shouldn't matter on which drive you actually install the game, that folder will always be on the same place.
Ive tried unhiding files but theres only local file in the appdata. I don't know what to do anymore, i think imma give up. Im just gonna play it without mods or with mods from workshop. Thx for replying man