OS Update on MacBook Air

Fairfax99 Said:

"OS Update on MacBook Air: i can't seem to update my MacBook OS from OS X Yosemite (version 10.10.5). My computer is a 13-inch MacBook Air, late 2010 model. How do i update?"

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See here: How to get old versions of macOS - Apple Support

Note: High Sierra is the farthest you can go on a Late 2010 MacBook Air

• macOS High Sierra 10.13 - Hardware Requirements - Apple Support
• macOS Sierra 10.12 - Hardware Requirements - Apple Support

The Age of this computer will Govern what newer version of macOS it will Qualify to install. Use About this Mac from the Apple Icon on Desktop - the required Information will be there.

With the above information in-hand - follow this How to get old versions of macOS and verify what version this computer Qualifies to install.  For Best results use Safari to commence the download as Others may not work.

Safari will open a redirect and open the Apple Store where the download can commence

• OS X El Capitan 10.11 hardware requirements
• macOS Sierra 10.12 hardware requirements
• macOS High Sierra 10.13 hardware requirements

Make Time Machine Backup  is very useful and can be used to Revert to Previous Working macOS

Are there any AntiVirus, Disk Cleaner, Optimizers, Un-installers, etc installed which should be removed as per Developers Instructions. They are useless, unneeded, cause havoc and interfere with the normal  operation of the OS and may even Corrupt the OS requiring a Reinstallation

A late 2010 MacBook Air can be upgraded to High Sierra 10.13.6 but no later version. See: How to get old versions of macOS - Apple Support