It is explained in another discussion thread.

This mod works with most Northern expansion quests. It doesn't work with original quests and freestyle. It is sad but it's hardcoded and can not be fixed via SDK.

In the video there's instruction how to modify quests from workshop to get it "workable" with this mod.

If game crashes on load it means that quest does not support additional players. You can modify it or if it is original game quest then just leave it.

If game freezes on load it means that quest map is too little and AI can't find spawnpoint. It happens usually if you activate 7 AI on small campaign maps. Try less AI players. Campaign maps mostly support 1 AI due to small map size.


If you want 7 players AI then try Big and Huge map quests. Or modify some another quest from workshop.

Have fun =)