No more data mismatch, and our mods work fine. I'm having this same problem still and as far as I can tell this would solve my problem. Where's the GustavDev folder located? Hey there! If using Steam, you can right click the game, go to Manage, then Browse Local Files. From ...
I added a folder browser in the latest update that will open if the data path isn't set, so that should help resolve that problem. It should also have a red error message if there's no game data folder to parse, when mods are loading. The readme does have this line in the setup ...