How do you upgrade OS X 10.4.11 tiger to a higher version of operating system such as OS x 10.5.6 as have tried running the upgrade disc on imac 5,1 with intel processor but only get message saying this cannot be installed with no further explanation ?

how do you upgrade OS X 10.4.11 tiger to a higher version of operating system such as OS X 10.5.6 as have tried running the upgrade disc on imac 5,1 with intel processor but only get message saying this cannot be installed with no further explanation ?

Retail Leopard disc looks like this;
(The disc itself has the same logo). If the one you've got is grey it simply won't work.
Given the retail and second hand prices of Leopard (usually some on Amazon MP), you'll probably find it cheaper to go directly to Snow Leopard, although there could be software updates and printer driver problems that could nullify the difference.

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