I have a MacBook that I bought in late 2010. It runs OS 10.6.8. I hadn't updated the OS because it was working fine for me, but it occurred to me the other day that I should do that. I tried upgrading to Yosemite. It looks horrible, so I wiped that thing and reinstalled my most recent Time Machine backup. Can I do an intermediate OS upgrade? If so, which version should I choose? Mountain Lion appears to still be for sale in the Apple store here: http://store.apple.com/us/product/D6377Z/A/os-x-mountain-lion. Every search I do for Mavericks redirects me straight to the page for Yosemite. Would I have to do something questionably legal to get Mavericks? Should I upgrade? I'm interesting in making my system last as long as possible so I can leapfrog this Yosemite nonsense.