MacBook Air Update
I am trying to update my operating system to Mac OS 10.13. The update is not listed in App Store. How can I download it?
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The model year of a MacBook Air is available at Apple menu > About This Mac.
A mid 2009 MacBook Air can be upgraded to El Capitan 10.11.6 but no later version. See: https://support.apple.com/en-us/HT211683
A late 2010 through mid 2011 MacBook Air can be upgraded to High Sierra 10.13.6 but no later version. See: https://support.apple.com/en-us/HT211683
A mid 2012 MacBook Air can be upgraded to Catalina 10.15.7 but no later. See: https://support.apple.com/en-us/HT211683
A mid 2013 and early 2014 can be upgraded to the latest version of Big Sur macOS 11 but no later. See: https://support.apple.com/en-us/HT211683
An early 2015 or later can be upgraded to the current version of Monterey macOS 12. See: https://support.apple.com/en-us/HT212735