I too had problems with installation on my mac. I would prefer to run in MacOSX, but I can't actually play in PRC persistent worlds when playing on my mac, so I boot into Windows and play that way.
Other worlds seem to work fine, its just PRC worlds that fail to work. I get a time out error every time I try to enter the one I play most. Basically, I did the same thing as the poster above..I did a manual install by placing the files in the correct folders. I heard that the haks need to be all lower case, so I tried that and it seemed to fail as well.