civilization-5civilization-5-brave-new-worldmacossteam
So to unlock Mods on your Mac version of Civ V, you need to comment out line 33 of MainMenu.lua. When Gods and Kings came out, MainMenu.lua moved, but the fix still worked. Now that "Brave New World" is out, it appears MainMenu.lua has moved again or has just been removed entirely.
Where's MainMenu.lua so that I can perform some surgery on it?
I had the same issue until after I installed TextWrangler, as the original response suggests. After I installed it and re-opened the G&K file path, there were numerous files I couldn't see before, including MainMenu.xml
Try installing a new text editor? If the files don't appear, you may be able to open it anyway with "Open File by Name..." from within the text editor. Odds are you have the file, you just can't see it; otherwise, it's unlikely your Civ V game would work.
I made a basic version which is generated directly from the game files, and includes all unique units:
(click on the image for a larger version)
Notes:
Best Answer
On my Mac, it's at the following location:
~/Library/Application Support/Steam/SteamApps/common/Sid Meier's Civilization V/Civilization 5.app).Show Package Contents.Contents/Home/assets/UI/FrontEndMainMenu.Luais in that folder. Looks like the line to comment out is 40 now.(I haven't tested this, but I've enabled mods before, and this file looks very similar to the old version.)