I tried searching the forums and documentation but could not find this information listed anywhere. Maybe I missed it but if not here’s what works for me. I recently got the Democracy 3 steam version and in order to mod the game I had to place files into this path…
~/Library/Application Support/Steam/SteamApps/common/Democracy 3/Democracy3.app/Contents/Resources
This is not to be confused with the other paths listed here for OSX since that’s the steam shortcut and not the real app location (I think). If you don’t have the steam version this will NOT apply to you.