The new version is unlike the older version in that the rar file contains an empty folder and a pak file. I put both in
C:\Games\SteamLibrary\SteamApps\common\Divinity - Original Sin\Data\Mods
..but I can't find the new version on the mod list ingame.
edit: oh, there's a new install folder. derp
I must be still derp because I don't get why there is an empty folder. The instructions are not clear.
Previously I had the mod in the Steam folder common\Divinity Original Sin\Mods\
Putting it in the documents\Larian Studios\Divinity Original Sin\Mods\4player\pak file etc doesn't work.
