How to install another macOS version on your internal drive Finally, make sure you back up your Mac before you start. You can find an installer for the current version of macOS on the App Store.

The second thing you’ll need is an installer for that version of macOS. If you have enough space, it’s a good idea to install it on the internal disk, especially on a MacBook Air or Pro, simply for convenience. The first thing you’ll need to do is decide whether you are going to install the other version of macOS - the one not currently running on your Mac - on its internal disk or an external disk.

You’re a software developer and need to test your apps on different versions of macOS.

You want to run the latest version of macOS but have some applications that won’t run on it and so you need to keep an older version to run those apps.You want to try out the beta version of a new macOS but don’t want to install it over the top of the existing version.There are lots of reasons, but the most common are:

The two versions can be on the same physical disk, or they can be on separate disks, depending on how much space you have on your internal disk and whether it’s convenient to add external storage. What does dual boot two versions of macOS mean?ĭual-booting simply means that you have two versions of macOS installed and can choose when you boot up your Mac which one to boot into. If that’s the case, the solution is to create a system where you can dual boot two versions of macOS. However, there may be a reason why you need to retain the option to boot into an older version of macOS. Most of us only ever need to run one version of macOS, and unless your Mac isn’t supported or you’re running software that isn’t compatible, that usually means the latest version. But to help you do it all by yourself, we’ve gathered our best ideas and solutions below.įeatures described in this article refer to the MacPaw site version of CleanMyMac X. So here’s a tip for you: Download CleanMyMac to quickly solve some of the issues mentioned in this article.

How to clear disk space on macbook