Question about the add-ons.

As far as I know, there are only two expansions – "The Coming Storm" and "Whirlwinds of War." All other additions are not official; they don't add anything new (except for Equi, but I downloaded maps with Equi objects, and the game seemed to work fine). So, feel free to consider "Chariots of the Gods" and similar ones as just collections of fan-made campaigns. ;) And all units, buildings, and so on appear in "Whirlwinds," including those from "The Coming Storm." ;)