I ran across a good how to on installing leopard from a DMG file which is helpful if you don’t have a dual layer DVD burner. There are legal ways to obtain a copy of Leopard that comes in a .dmg file. These are spelled out in the how to. If you do have access to a dual layer DVD burner then just burn the stinkin’ image and install that way. This is not something an amateur should expect to do very easily. Read on for more details.