Did you unpack it into /mod folder in Dominions3 folder?
Sorry to bother you with this again but I can't find a /mod folder. There are folders titled: battlemaps, doc, maps, rawsound, and tutdata but thats it.
My experience, again: I've played half a dozen single-player games, a couple of which were fairly large. I've become decently skilled against the AI but I haven't played against humans.