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You can either start from the CD/DVDs you have, buy newer retail versions, or take it to an Apple Store & they'll do it for you, there's no 4th option on a machine so old.– TetsujinCommented Jun 11, 2017 at 14:28
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I know Mountain Lion can be installed to that particular model. As I've personally done it. However you'll need to install via a USB boot disk. Which can only be downloaded from the app store on a newer, eligible, system though. If I recall correctly. Mountain Lion was the first major update Apple gave out at no cost for eligible hardware.– TerusCommented Jun 11, 2017 at 18:36
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