The practical questionīut lets take a step back. Lion-installation articles), I can tell you that it’s a real hassle. Having performed this two-step upgrade many times while researching our various Mountain Lion-installation articles (and last year while writing our 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 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 Mountain 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’s never been upgraded to Snow Leopard or Lion? The Mountain Lion license agreements say that even if that Mac is compatible, you can’t upgrade to 10.8 until you first install at least Snow Leopard. If your Mac doesn’t at least have Snow Leopard installed, you can’t install Mountain Lion.
If your Mac shipped with Leopard or Tiger (Mac OS X 10.4), but you later purchased and installed Snow Leopard or Lion, you can install Mountain Lion.
The software license you agree to when you install Mountain Lion states that you can “download, install, use and run for personal, non-commercial use, one (1) copy of the directly on each Apple-branded computer running OS X Lion or OS X Snow Leopard…that you own or control.” In other words, if your Mac shipped with Lion or Snow Leopard, you can install Mountain Lion.
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