10.5: Install Leopard on an older Mac

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10.5: Install Leopard on an older Mac
Authored by: baltwo on Thu, Nov 8 2007 at 8:55PM PST

Doing that using the upgrade or A&I installation option on top of a Tiger installation, usually results in a prohibitory sign when trying to boot an unsupported Mac; at least that's what I found during beta-testing. Doing an Erase & Install from a supported Mac onto a FWHD and then using the Migration Assistant to transfer from the Tiger installation worked.

WRT to the noted hack and this one, http://blog.kupferman.net/?p=3, which I think is easier, if you don't modify the OSInstall.mpkg, then you won't be able to use it to run the Utilities, do an A&I installation, etc. Do the hack to a restored install disk on another volume or external HD.