Just wanted to throw out a heads up on something that stumped me all yesterday. After downloading .84b5, when I unzipped the file with standard OS X built in app, it was creating another file type instead of the folder with the .img file in it. By using The Unarchiver app (free) I was able to get the proper .img file out of the archive I downloaded. Not sure if anyone else may have had this issue on a Mac.