Mооnst@r
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Well, then, exploring the alternative is a good idea. After all, we won't be able to influence the Tribes of the East, as there will essentially be nothing left to influence.
Mods for all the campaigns are as old as the hills. Two or three, maybe four (two - 100%). They've all been scattered around the world for a long time. Downloading a fix for the mod or searching for another one, but with pearly buttons, the choice is obvious.
Added 2 minutes later
If all the graphical bugs have been fixed, I would pay attention to the AI behavior. In the Queen campaign, mission 5, "Sunset of the King," the demons simply run away instead of fighting when attacking the castle. In the Warlock campaign, mission 3, "Servant of the Cult," they do nothing when the demons appear. In the Ranger campaign, mission 3, "Defense of the Undead," they also essentially do nothing.
That's not something I can help with.