How to download old macOS Versions: Step-by-step guide

Macworld
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. Perhaps your Mac has run slowly ever since you updated. 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 S