How can I update my OS from OS X 10.10 to OS X 10.11?
How can I update my OS from OS X 10.10 to OS X 10.11?
MacBook Air 11″, OS X 10.10
How can I update my OS from OS X 10.10 to OS X 10.11?
MacBook Air 11″, OS X 10.10
Back up your data and click on the link for El Capitan in the Related Article above.
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Download OS X El Capitan from How to get old versions of macOS - Apple Support.
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How can I update my OS from OS X 10.10 to OS X 10.11?