HT201364: OS X Mavericks system requirements
Learn about OS X Mavericks system requirements
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Helpful answers
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Jan 5, 2015 6:26 PM in response to martinfromborgerby a brody,Only if you kept the original installer file. YOu may be able to request AppleCare release it for you in your App Store, since your Mac came with 10.9.
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Jan 5, 2015 6:27 PM in response to martinfromborgerby a brody,Also if you make a Clone backup of 10.9 before upgrading that will help.
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Jan 6, 2015 10:49 AM in response to martinfromborgerby Eric Root,Do a backup, preferably 2. Check your Purchases tab at the App Store to make sure it is there.
If you do revert, I'd use Setup Assistant to restore your data. This process takes a while, so do it when you won't need the computer for several hours, based on my experience.