I just installed 0.9.4 on my early 2008 iMac. Civ IV is the mac store downloaded version. I installed the mod at
/Applications/Civilization IV/Contents/Civ4 Data/Mods
This is the closely position that I can find matching the suggestion locations. All other default mods (coming with the software) are located here. The mod that I installed does not have version number and not double nested. I have applied the patch (7 files) as well.
I then launch Civ IV, choose mod "History Rewritten", and then the application restarts (which is normal and required for other mods). Then Civ IV starts to load "History Rewritten" until reaching the strage: "Init XML (uncached)". Then many many error messages pop up. I tried to upload the screenshots here (not all of them as not allowed by the system).
Please help to fix this problem. Thanks.
Edit: maybe I should try to put the mod in ~/Library/Application Support/Civilization IV/Mods ?