Maybe the fact that it is not on Steam might be the issue, have you tried to change from the initial file which the system looks for when you launch the executable.bat of the mod? I think with the hardcopy it uses the kingdoms.exe instead of the medieval2.exe file.
Also apologies for the late reply, I have been quite busy the past few months :)
Reckless_Merc
joined
This member has provided no bio about themself...