CBM 1.21 can be downloaded
HERE .
Mod installation is easy: unzip the file, copy all of it's contents to the Mods folder in your Dominions 3 directory, open the game, select Preferences-->Mod Preferences-->Conceptual Balance Mod.
This game will presumably begin later today, so I HIGHLY recommend practicing w/CBM asap; at least try out the new pretenders, most have been tweaked.