So the problem that John was having is that his computer somehow got corrupted or something and it wouldn’t allow him to install any DMG files.  So after doing research the solution was to install a patch, but that patch is provided in DMG format, which he can’t open.  So the solution.  Reboot the problem computer, hold down the T key upon reboot so that it will start up the hard drives but not the OS.  Then connect a working computer to this computer via FireWire cable.  And then open the dmg file that can’t be open, then move the PKG file that is within the DMG file, and put it on the broken computer.  Then reboot the broken computer, and then run the PKG file.

Then after the broken computer runs the PKG file, it will probably reboot a few times, but then it will be working again.  So this is my brief solution on how to let a computer that can’t open DMG files to open DMG files.