You may be fine leaving it with the version that it’s currently running. In fact, if you have a particularly old Mac gathering dust and you’d like to update it, it might be fairly difficult to find the latest version of macOS that it can run. Not every Mac out there in the wild is capable of running macOS Catalina. The most non-technical reason for needing an older version of macOS is simply to update an older machine. (That list might include system administrators, security professionals, developers, etc.) If you fall into the category of needing an old version of macOS, you’ll know it. There are a number of reasons why keeping an older macOS installer is a good idea, but most of them are fairly technical. Why would you need old macOS installers? Old macOS installers can be used for a variety of purposes, including creating bootable USB drives. Here’s what you need to know about finding an old macOS installer image, why you might need them, and some tips on how to collect them going forward. This may be especially pertinent information because of a recent security certificate expiration back in October. Need to run 32-bit apps on macOS Catalina? Use a Mojave virtual machine.How to install macOS or OS X on a new hard drive for your Mac.How to clean install macOS Catalina (without a bootable USB).But while it is difficult, it’s still completely possible. Apple, for whatever reason, makes it fairly hard to find installers for older versions of macOS.
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