While the letter of the law says you need to install Snow Leopard before installing Lion, the spirit of the law seems to be that a particular Mac just needs a license for Snow Leopard before you can install Lion on it. Having performed this two-step upgrade many times while researching our various Lion-installation articles, I can tell you that it’s a real hassle.)īut lets take a step back. (This is just one scenario-I can think of a number of situations in which you might have Leopard on a Mac or an external hard drive, along with a valid license for Snow Leopard, and you’d rather not take the interim step of installing Snow Leopard just to upgrade to Lion. But what if, for example, you’ve got a family-pack license for Snow Leopard, and you’ve got a Mac that shipped with Leopard but that you never upgraded to Snow Leopard? Assuming that Mac is compatible, the Lion license agreement says you can’t upgrade to Lion until you first install Snow Leopard. If you didn’t purchase Snow Leopard, you can’t install Lion. If your Mac shipped with Leopard, but you later purchased Snow Leopard for, and installed it on, that Mac, you can install Lion on it.
#UPGRADE FROM LEOPARD TO MOUNTAIN LION MAC MAC OS X#
The software license you agree to when you install Lion states that you can “download, install, use and run for personal, non-commercial use, one (1) copy of directly on each Apple-branded computer running Mac OS X Snow Leopard or Mac OS X Snow Leopard Server…that you own or control.” In other words, if your Mac shipped with Snow Leopard, you can install Lion on it. In other words, you need Snow Leopard just to purchase and download Lion.īut once you’ve got your copy of Lion, can you install it onto a Mac or a hard drive containing Leopard (Mac OS X 10.5)? The main practical reason for this requirement is that Lion is available only via the Mac App Store, and the Mac App Store debuted in Mac OS X 10.6.6.
As I explained in Installing Lion: What you need to know, one of the requirements for installing Lion is that you already have Snow Leopard (Mac OS X 10.6) version 10.6.6 or later installed.