how to upgrade to OS X 10.11
How to upgrade my MacBook Air from OS X 10.10.5 to OS X 10.11?
How to upgrade my MacBook Air from OS X 10.10.5 to OS X 10.11?
If your Mac isn’t capable of running High Sierra, use the link in the article you asked this question from.
If it is, you’ll only be able to if you have access to an Apple ID previously used to download it; to do this, log into the Mac App Store with it and click on the Purchases tab.
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If your Mac isn’t capable of running High Sierra, use the link in the article you asked this question from.
If it is, you’ll only be able to if you have access to an Apple ID previously used to download it; to do this, log into the Mac App Store with it and click on the Purchases tab.
(158560)
Check to make sure your applications are compatible.
El Capitan 10.11 Compatibility information
macOS Sierra 10.12: Compatible Apps
Also check to make sure there is a compatible driver for your printer.
Do a backup before installing, preferable 2 backups on 2 different drives.
how to upgrade to OS X 10.11