HT201250: Use Time Machine to back up or restore your Mac
Learn about Use Time Machine to back up or restore your Mac
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Feb 13, 2014 1:07 PM in response to Stixx48by Eustace Mendis,If you click the black Apple icon on the top left of the screen and then select Software Update..
The computer will guide through the various updates and upgrade. there may be more than you have to do before Mavericks is presented as an available upgrade.
Since you are now running OS 10.8, you can upgrade to 10.9.1.