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Message: <blockquote data-quote="pigoo3" data-source="post: 1087863" data-attributes="member: 56379">Is this OS 10.5 Leopard disk a "full" install disk or a true "upgrade" disk?Apple did distribute a 10.5 upgrade disk that required the computer to have OS 10.4 "Tiger" be present before the "upgrade" to 10.5 could take place.  So if you're trying to "downgrade" a computer from 10.6 to 10.5 using a 10.5 "upgrade" disk...it won't work since the upgrade disk is looking for 10.4 on the hard drive.I believe Apple actually called this a "Drop-In" Leopard (10.5) install disk.Of course if your 10.5 disk is a full install disk...then that's a different matter.- Nick</blockquote>