How to install older versions of macOS or OS X

There are a few reasons why you might want to install an old version of macOS or Mac OS X. Perhaps you are relying on software you have discovered doesn’t work properly in the newest version of macOS and you want to downgrade macOS. Maybe you are a developer and you need to be running multiple versions of macOS so that you can be sure that your software runs correctly on them. Or possibly you just don’t like the

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