I have a similar issue. When I extract from the zip file, all it shows in the executable. I can find the game directory folder, but it's in AppData>Roaming>YeahMaybe, so I'm not sure if I can add my own packs. Either way I would prefer all the game data to be in the same location as the executable. The solution you posted wouldn't work for me, I don't have the itch desktop app.