One more argument is that the free space on your disk translates into virtual memory so your apps have “fuel” to operate on. This includes not just space for the OS itself but also space for other applications and your user data. Given your Mac isn’t new and is filled with data, you will probably need enough free space on your Mac. We’ll be repeatedly referring to these Apple OS versions below, so it’s good to know the basic macOS timeline. You might be blocked from installing a certain version due to age of equipment, such a. Mac users can download OS X 10.8 Mountain Lion Golden Master, OS X 10.8 Mountain Lion Server Golden Master, OS X Mountain Lion 10.8 VMware with InstaSign (OS X Virtual Image with support for hardware that doesn’t support virtualization), OS X Lion 10.7.2 Vmware With InstaSign (OS X Virtual Image for Resigning Apps on Windows), Xcode 4.6 and iOS 6.1 SDK beta 4, Xcode 4.4 Developer Preview 5.
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Also, you may have noticed your Mac’s performance went down right after the last update. To begin with, some of your apps may not be working properly (or simply crash) on newer operating systems. There are many reasons that could point you to this radical decision. So, you’ve decided to download an older version of Mac OS X.