Bailknight's is sadly out of date for Diplomacy. You can use it just fine in Entrenchment, as 1.051 is the latest version, but 1.31 is the most recent for Diplomacy. Double check posts on its modding thread, but I think it may work by deleting or renaming the gameinfo folder, though this may cause some features not to appear or work right. Also many other mods have Bailknight's built in, so you could just get one of those.

Run Impulse.  If you've registered your game, log in and go to the my games tab.  You will see your games with the status of Updates Available.  Right click on it and select update.