Okay here is a quick fix for error 192 while I look for the overall solution. There is a privilege error in MacOSX that we have both encountered. What you need to do is make a folder on your hard disk, label it as Downloads (or something similar and easy to remember) take all your files that would not go through disk copy and place them in this folder. Okay, then log out of the computer and log back in as the root administrator. Your user name will be root and your password is the password you first gave the computer when you installed X. What the difference is from root administrator and you is that the root has all privileges and can see all invisible files, so be careful in here. Once in the root go to that downloads folder and you can mount your disk images now, after you have installed everything then go back to your regular adminstrator level, that's the solution I found for now. By the way I hope the anticipated "puma" release of MacOSX fixes all this mess because these privileges suck right now!