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How can I update macOS from Catalina to Big Sur?
iMac 27″, macOS 10.15
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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
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 your iMac meets the hardware requirements, follow the steps mentioned in this article, after you opened it in Safari:
I guess I’m buying a new laptop to run next years tax software. This iMac has been a Godsend. I’ve used: windows 95, 98, 2000, Xp, vista, apples os, Linux, I’d have to say Apple and red hat linux were far superior to windows in every way.
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