I can't figure out how to use this mod, since I can't select any of the map types, even when subscribed to individually.

nice!

Yes, that's the issue with making all desert & snow maps. Therefore on these maps, I specifically placed 8 arable tiles that each civilization will automatically spawn near. I also created 12 city-state spawning locations which are both the default amount for a standard-size map. (8 civilizations & 12 city-states)

In short: You must play Tatooine & Hoth with the default amount of civs (8) & city-states (12) for a standard-size map or the AI won't function properly.

a very well done mod

The problem I ran into with this is that both Hoth and Tatooine don't have any tiles which the game accepts as playable for the AI Civs and City-States. You just see their units and settlers hanging around without settling.