Answer (1 of 3): There is no definitive timeline for stopping support. And unless you have previously downloaded a copy of an older operating system, then Sierra is the next upgrade available to you. A MacBook Pro 15' Mid-2012 came with Lion 10.7.3, and that is the OLDEST operating system version it will run. My MacBook doesn't show any update for OS. Can MacBook Air (13-inch, Early 2015) update OS 10.12 or later. Support Communities / Mac OS & System Software / OS X El. This video will show you how to install software updates on any Mac runs Yosemite only, This works for MacBook Pro, MacBook Air, MacBook, iMac, Mac Mini & Ma. If you want to update apps downloaded from the App Store, use the App Store to get updates. If Software Update says that your Mac is up to date, then macOS and all of the apps it installs are up to date, including Safari, Messages, Mail, Music, Photos, FaceTime, Calendar, and Books.
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