
UPGRADE MAC OPERATING SYSTEM 10.10.5 HOW TO
How to upgrade to macOS High Sierra - Apple Support How to upgrade to macOS Mojave - Apple Support Your 2014 MacBook Air can upgrade to all these below read the following links. The model and year of your Mac will determine which macOS you can upgrade to, You can learn more about how to upgrade to macOS Catalina here: How to upgrade to macOS Catalina - Apple Support You can download OS X El Capitan 10.11.6 here: Download OS X El Capitan You can download macOS High Sierra 10.13.6 here: Get macOS High Sierra You can download macOS Catalina 10.15.3 here: Get macOS Catalina
UPGRADE MAC OPERATING SYSTEM 10.10.5 UPDATE
Be careful downloading update files from other sources. The Mac App Store is the best, and usually only, place to download macOS updates.


Check what version of OS X or macOS your Mac supports.You'll need at least 8 to 22 GB of free storage space to upgrade to a newer version of OS X or macOS. Make sure that you have enough storage available for a software update.
