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You can install Big Sur direct from Apple, which is still young enough to support almost anything. You won't find it on the App Store by searching; use the Big Sur link from here: https://support.apple.com/en-gb/102662
I've just done the exact same thing to my wife's 2014 MacBook Air, which like yours is in good condition and powerful enough for her needs. Everything works now.
Hello Macheads
I have a Macbook air from 2014 that's being forced into obsolescence.
I'm stuck on OS X Yosemite version 10.10.5 which means that I'm using an outdated version of chrome which doesn't support a lot of websites, and I can't download any new programs. It won't let me update to the newest OS even though I cleared the mac and made space for it.
It's a shame as the laptop has had light use, battery is solid and it would perfectly fit my needs of browsing the internet, and using it for meetings at work etc.
Is it really the end? or can something be done to save it?