HT201260: Find the OS X version and build number on your Mac
Learn about Find the OS X version and build number on your Mac
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Oct 1, 2013 12:06 AM in response to rajaraoby clintonfrombirmingham,Simply purchase Mountain Lion from the App Store and it will begin installation after the download is complete. Note that it's a large download, about 4.5GB, so you should have a good Internet connection..
However... if I were you, I would just wait another month or so until Apple releases Mavericks - the 'latest' announced version of OS X -> http://www.apple.com/osx/preview/.
No need to pay for two upgrades in a months (or so) time...
Clinton