The Problem
Nearly every mod out there for Medieval II is made for the disk version which, for 2 years, has been different to the Steam version. As they are mods for Kingdoms expansion, the installer searches for this expansion but doesn't find it and therefore doesn't install the mod.
Fixing It
Go to your Medieval II directory:
C:\Program Files (x86)\Steam\SteamApps\common\Medieval II Total War
Copy and paste "medieval2" and rename the clone "kingdoms". This is all you need, as technically it is kingdoms.exe, even if it has the exact same function. Mods will now install fine.
By the way, the vast majority of mods have a quicklauncher. You don't need to rename one of the other campaigns (such as teutonic or americas). You can have them as seperate mods and it'll work fine.
Source: https://steamcommunity.com/sharedfiles/filedetails/?id=745376228
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