Updating my Mac OS
I wanted to download my Mac OS on my my MacBook Air 2014
i was able to download the update but installing the update has become a problem
MacBook Air 13″, macOS 10.14
You can update an Early 2014 MacBook Air as far as Big Sur – but no farther.
Which version of macOS were you trying to install, and what particular problem did you have installing it? You're more likely to get help from someone here if they have something to go on.