HT206886: How to get macOS Sierra
Learn about How to get macOS Sierra
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Helpful answers
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Nov 7, 2015 2:12 PM in response to dawn4ozby FatMac>MacPro,While the upgrade should start to run automatically and then wait for you to give further instructions, I've read that that doesn't always happen. In that case, look for "Install OS X El Capitan" in your Applications folder and doubleclick on it to get it started.