How to download and install old versions of macOS + infographic of Mac OS evolution

Running the latest macOS is not always the best decision. There are plenty of reasons you might want to downgrade or run an older version of macOS on your computer.

You may find that after the latest update your computer runs slower, your apps don’t function, or that the programs you need to run are not yet compatible with the upgrade. Maybe as a developer, you want to create a test environment to ensure your software runs properly in all available versions of OS X (check out the infographic below). Or you may simply like the look of an old version better.

How to install old OS X on your Mac

Although you might think that going back to the old macOS is not possible by looking at the App Store Updates tab, it’s actually quite easy to do. In this article, we’ll take you through everything you need to download and install an old OS X on your Mac.

Prepare your Mac first

Make sure you are ready to downgrade your operating system by checking what macOS version you currently use and ensuring you have enough hard drive room to download an older version.

Click Apple in the top left corner of your screen and choose About This Mac. See your current macOS version. Tabbing over to Storage will let you know how much disk space you have available. On macOS Ventura, the flow is slightly different: open System Settings and head over to Storage. You’ll need at least eight gigabytes of storage, depending on which macOS you downgrade to.

storage macos

Even if you do have enough space, it’s a good idea to clean your computer before installing the desired operating system. You can, of course, do so manually by deleting unused files and uninstalling old software to free up disk space. Depending on how tidy your Mac is, this might take quite a bit of time.

To make things easy, use a specialized app like CleanMyMac X that will quickly free up space by detecting unused apps and large files, and offering to completely delete them, with all their hidden corresponding files, in one quick click.

cmm Macos

Optimizing your Mac with CleanMyMac X is effortless:

Open CleanMyMac X via Setapp
Choose Smart Scan and click Scan
Review Details to see the list of suggested optimizations
Click Run.

To uninstall certain apps, find the Uninstaller tab and select the apps you haven’t been using for a while.

The final preparation step is to make sure you back up all your important files to cloud storage or an external drive. A proper backup app like Get Backup Pro can save you a lot of headache here because all its backups are bootable and beautifully compressed, which makes it superior to the default Time Machine.

get backup pro

To create a new backup with Get Backup Pro:

Connect your external hard drive
Click the plus icon in the bottom left corner
Type in the name for your backup
Choose your external drive as a destination
Adjust all the settings according to your preferences and click OK
Tap the play button once you are ready to perform the backup.

Download the OS X you want

Once you have space on your computer, figure out what version of OS X you would like to install. On older versions, you can find the previous versions of OS X installed on your Mac by opening the App Store > Applications and viewing your Purchase page. Click the Install button next to the macOS you want to download.

macOS Ventura 13
macOS Monterey 12
macOS Big Sur 11
macOS Catalina 10.15
macOS Mojave 10.14
macOS High Sierra 10.13
macOS Sierra 10.12
OS X ElCapitan 10.11
OS X Yosemite 10.10
OS X Mavericks 10.9
OS X Mountain Lion 10.8
OS X Lion 10.7, released in 2011

If your goal is to download a version of macOS that you have not already used, or, that was not available as an update from the App Store after you bought your Mac, you may need to purchase it. The earliest versions, OS X Lion and OS X Mountain Lion are available on the Apple Store’s website and arrive to you via email for download. OS X Snow Leopard ships as a boxed version and requires a disk drive to install.

It could be helpful to know where you sit on the timeline of macOS X updates. Below is a chronological list of all the updates beginning with the most recent update, Ventura, released in 2022:

macOS Ventura 13
macOS Monterey 12
macOS Big Sur 11
macOS Catalina 10.15
macOS Mojave 10.14
OS X High Sierra 10.13
OS X Sierra 10.12
OS X ElCapitan 10.11
OS X Yosemite 10.10
OS X Mavericks 10.9
OS X Mountain Lion 10.8
OS X Lion 10.7, released in 2011

Visiting the Apple Support’s Downloads page makes it easy to search for any version of macOS you might need, and most are available for free. Downloads for previous versions of OS X are linked below and include:

Alternative sources for downloading macOS

If you can’t find the version you want from Apple, ask a friend who is running the macOS you’re looking for to make a copy of the installer file for you. Downloading a .dmg file from a torrent site may seem a quick solution, but it means risking your security. Alternatively, you could hit up your nearest Apple Store. They will likely have image files of all the different versions of the software and help you install it right there as well.

Install the macOS

If you download the file from the App Store, the installer will start immediately. Follow the prompts and be prepared to restart your computer. If you acquire the installer from another source, just downloading a file will not install macOS right away, you’ll need to find the file in your Downloads or Applications folder, then open and run the installer from the downloaded file.

I can’t download an old version of Mac OS X

A downgrade is different from an upgrade. When you try to downgrade macOS, the installer may not launch right away depending on which versions of macOS you are moving between. If your installer does not launch, or you get an error message that reads: “This copy of the ‘Install OS X’ application is too old to be opened on this version of OS X,” you’ll need to use a bootable USB or external drive to work around this problem.

Get a bootable drive with OS X

Creating a bootable USB or a bootable drive is not complicated. You’ll need an external drive with enough space to hold your desired macOS on it. Use an app like Disk Drill to help create a boot drive: our guide on creating a bootable installer will walk you through all the necessary steps.

bootable usb macos

Remove the old OS X

Once your drive is prepared with your bootable version of OS X, erase the unwanted version. After you restart your computer, press and hold Command + R. When you enter the macOS Utilities screen, navigate to Disk Utility, click continue, and find your Startup Disk. Tab to the Erase page and name the file you want erased (e.g. macOS High Sierra). Then select Mac OS Extended (Journaled) from the dropdown menu. Hit Erase and quit out of Disk Utility. This will return you to the OS X Utilities selector.

Install the bootable version of OS X

If you used Disk Drill for creating your bootable drive, a window will prompt your actions for using the install disk you made. But if you created your own using Terminal, use OS X Utilities Selector and find Reinstall OS X. Find and select your install disk with your bootable version of your preferred macOS, and click continue through to the license agreement. Once you agree, you should be prompted by the installer. Once the installation is completed, your computer should restart. If it does not restart itself, make sure you restart it normally. The downgrade should be complete!

As you can see, downgrading your macOS is not as dreadful as you might think, especially if you use helper apps like CleanMyMac X, Get Backup Pro, and Disk Drill — all of which are available for a free trial on Setapp. So downgrade away!