I just installed that on a fresh XenForo installation and it seems to work correctly. Double-check the case of the folder names, as it would be case-sensitive. I downloaded my hack attached here and installed that, so it should work.
Case is exactly as you have put it up. You'll probably gather if you've read any of my recent posts im not the sharpest tool in the box, but this all seems pretty straight forward so im really not sure where im going wrong!