Get your desired OS X or macOS from the list above.Download a trial or purchase a license to Parallels Desktop.It’s very easy to create a new macOS virtual machine in Parallels Desktop. It boils down to what Parallels Desktop was invented to help accomplish: getting the most out of your Mac. It’s almost too good to be true to be able to run your favorite or needed 32-bit applications on a freshly updated Mac-but it’s not. The same virtualization technology lets you run older macOSes on Mac-without rebooting or partitioning your hard drive. The virtualization market has crowned Parallels Desktop as the award-winning solution to run Windows on Mac. Most versions are available on the developer portal:.macOS Server: (With this link you can purchase it).10.3, Panther: (Only with an Apple Developer account).10.5, Leopard: Beta builds available at (Only with an Apple Developer account).10.6, Snow Leopard: (Only with an Apple Developer account).10.7, Lion: (With this link you can purchase it).10.8, Mountain Lion: (With this link you can purchase it).10.9, Mavericks: Beta builds available at (Only with an Apple Developer account).Note: Apple often changes the availability of OS X and macOS, so we will keep this list as up to date as we can with the help of Apple communities. Thanks to Krypted, we have a list of older versions of macOS and Mac OS X to download directly from the Mac App Store. However, Apple doesn’t make it easy for a basic user to access older macOS or OS X® operating systems. The Parallels Desktop Installation Assistant makes it easy for macOS users to create a macOS virtual machine even after upgrading to Catalina-so users can still run 32-bit Mac applications on their current Mac. Mac users will be able to continue to run 32-bit applications or programs-even if they are using macOS Catalina-with the help of Parallels Desktop® for Mac. Running a version of macOS on an external drive is a great solution if you wish to continue to run the version of macOS currently installed on your Mac.Apple claims Mac users will not have support for 32-bit applications or programs on macOS Catalina. How to run an older macOS on an external drive Follow the instructions to reinstall macOS using the installer you just saved to the external drive (link to separate article above). Now click on Reinstall macOS or Reinstall macOS and Continue.Quit Disk Utility (Disk Utility > Quit Disk Utility).Select the main volume and click Unmount then Erase.To start this process, restart the Mac in Recovery Mode by holding down Command and the R key during restart. Next you need to completely erase everything from your Mac, restoring it to factory settings.Use this installation file to create a bootable installer on an external storage device.Download the installer of the version of macOS that you require from the Mac App Store.You will be wiping your Mac and installing the version of macOS you require on a clean slate. This is a process known as a clean install, which we look at in more detail here: Note: This will wipe your Mac so make a copy of anything you want to keep! How to install an old macOS using bootable installer Your Mac will restart once the installation is complete.Select your startup disk and click Install.Click Continue and follow the on-screen instructions.Once you see the macOS Utilities screen choose the Reinstall macOS option.(It didn’t actually work for us when we tried, perhaps because our internet connection wasn’t good enough, but it should work in theory!)
While we are talking about Recovery, you might like to try the following method of downgrading your Mac to the version of macOS it shipped with. How to downgrade to the OS that shipped on your Mac
How to restore your Mac from a Time Machine backup. Remember that if you recover from an old backup you will lose the data you have added since updating to the version of macOS you wish to uninstall.
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