Hey guys, so I just bought a used Macbook Pro. It is the last generation. And It has Tiger loaded on it, but I want to upgrade to Leopard. I have a friend who recently bought a brand new Macbook Pro and he let me borrow his restore disks with leopard on them. I tried to install them on my older Pro and it said this software cannot be installed on this computer. Why is this? Am I doing something wrong? Or do I have to buy my own upgrade?