What should I do?
MacBook Pro
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.
macOS Big Sur 11 hardware requirements Does this specific computer Listed as Qualifying for Big Sur ?
macOS Catalina 10.15 hardware requirements
macOS Mojave 10.14 hardware requirements
macOS High Sierra 10.13 hardware requirements
macOS Sierra 10.12 hardware requirements
OS X El Capitan - Technical Specifications
Caution - jumping over all the newer versions and directly to Big Sur / Monterey on Qualifying computers is Technically possible - there are those who have attempted and were successful.
Then there are those who attempted and had less than good results.
If this is a Production or Mission Critical Set-up - a more prudent and measure approach is suggested.
The above is from observations on the Apple Support Community Forums and IMHO
Tips Big Sir Upgrade Released Nov 2020
Make Time Machine Backup is very useful and can be used to Revert to Previous Working macOS
Notation - Mojave is the Last version to support 32 bit applications / extensions and Drivers. Catalina, Big Sur & Monterey supports only 64 bit and there is no workaround.
Suggest using Go64 to find 32 bit application before attempting the upGrade. Some or many of the Application already installed may required update or upGrades to 64 Bit Versions.
If that is a 4GB RAM version of the 2014 MacBook Air, do not install Big Sur as it will eat the Mac alive and you will have no performance whatsoever. I did this as an experiment and the first sentence stands.
I’ve recently restarted this 2014 macbook pro and it’s currently running on OS X version 10.9.5. When i try to update it nothing appears. I can’t find Mac Os Big Sur anywhere. When i click on the app store and check for updates nothing appears.
