There are a few reasons why you might want to download and install an old version of macOS or Mac OS X. Perhaps you’re relying on software you have discovered doesn’t work properly in the latest version. Or maybe you just don’t like the new version of macOS that you have installed. Either way, you have questions and we have answers.
In this article, we will cover how to get old versions of macOS, including Monterey, Big Sur, Catalina, Mojave, El Capitan, Sierra, Yosemite, and even old versions of Mac OS X. We explain how to get hold of the relevant installer files so that you can install the software on your Mac.
If you are looking for a way to revert to the previous version of macOS, we have a more specific article about downgrading. And remember, if you were hoping to run Catalina, Mohave, or a version of macOS older than Big Sur on an M1- or M2-series Mac, that’s not possible.
Read more at Macworld.com