StarCraft II.app, Blizzard Downloader.app and Blizzard Updater.app was extracted from *.mpq installer. You can try to install client on MAC, THIS IS NOT A CRACK - just client to watch replays. Please test if anyone can and mirror the link
http://letitbit.net/download/1929.1e64d26032d566fa9743b956a/Mac_SC2.zip.html (http://letitbit.net/download/1929.1e64d26032d566fa9743b956a/Mac_SC2.zip.html)
thanks Uther!
P.S
Use anti virus when downloading ANY files - this file was not tested yet!