operating system upgrade
I have a MacBook Air from 2014 that has the OS X operating system. What is the best operating system that this computer can handle and how to I upgrade to it?
MacBook Air
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Welcome to the Apple Support Communities.
You should upgrade to macOS Big Sur: How to get old versions of macOS - Apple Support. It is the latest compatible version of macOS for your Mac.
Backup before upgrading!
Jack