Ah, I got it to work for me. My problem was I installed it over the directory in which I had MedMod IV v3 installed, rather than a fresh, clean install of M:TW VI with the patch. Apparently, MMIV v4 isn't compatible with MMIV v3. Heh, go figure.

Alexius, I see what you mean. Wes changed the names back to the originals while testing to find the source of a CTD causing error. He hasn't changed them back yet, apparently while we're testing. The provinces are there, they just don't show unless you have a faction which uses them or have units near them. The outlines of the new provinces show up when you're near enough to see them; although they'll overlay the old province names in some cases. Also, the new names will show up if you right click on the provinces. I assume that Wes will be putting the new province names back in at some point prior to a final release.