trying to update from yosemite to el capitan
How can I upgrade my 2012 MacBook Air 13" from Yosemite 10.10.5 to El Capitan? I'm not able to do it via the current live link in the App Store.
MacBook Air 13", OS X 10.10
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As your Mac can upgrade to a newer OS than El Capitan the App Store refuses you the download.
You should be able to upgrade to High Sierra, How to upgrade to macOS High Sierra - Apple Support
And you can upgrade to Mojave, https://apps.apple.com/gb/app/macos-mojave/id1398502828?ls=1&mt=12
Before upgrading make a full back up of your Mac.
Check that third party apps you use have updates available for the new OS.
Check that your printers/ scanners etc have updated drivers and software available for the new OS.
macOS Catalina was released recently, the latest version of macOS.
If you are considering upgrading to Catalina be warned that it does not support 32bit apps.
Your Mac is probably running 32bit apps and these will need to be updated to 64bit apps,
some updates may be free, some may be paid. Use this app to discover which apps you have
are 32bit, https://www.stclairsoft.com/Go64/. Once the list has been created you can then
contact the developers of the apps to see if they provide 64bit updates.