Can I upgrade or downgrade to Snow Leopard (OS X 10.6)?
OS X Snow Leopard is considered the last version of the operating system that was predominantly designed without major influences from i OS devices, such as the i Pad and i Phone.
Once you install the OS, you can use the Mac App Store to update to any of the later versions of OS X, as well as purchase and install many apps for OS X.
Let's take the upgrade or downgrade question as two separate inquiries.
Snow Leopard was publicly unveiled on June 8, 2009 at the Apple Worldwide Developers Conference.As a result, it remains a highly desirable version of OS X, and is still available from Apple as a direct purchase from the Apple web site.The reason Apple still sells OS X Snow Leopard is because it's the first version of OS X that includes support for the Mac App Store.The quick and dirty answer is, if your Mac uses an Intel processor then you can upgrade to OS X 10.6 (Snow Leopard).However, there's much more you should know before you make a final decision.Our hard drives always seem to be shrinking, and it’s often hard to tell where most of that space goes.