Turning the mod into 3 player mod instead of 4 player:
1. Download
first part of mod2. Place it in your documents mod folder like any other mod.
3. Download
second part of mod 4. Place it in [your Divinity Original Sin]/data/mod folder, if you don't have this create it.
This will disable the fourth Source Hunter, both in the character creation screen, and ingame.
I'm not really comfortable with modding, hence the akward way of installing it. Maybe it works without the second part of the mod. All credit goes to Tiaexz, I only deleted a couple of things.