This guide can help you roll back to almost any version of macOS. Older versions of macOS might experience problems restoring from Time Machine backups made on subsequent releases. For example, trying to restore a Time Machine backup made in Big Sur released in in macOS Catalina released in could prove difficult. As a last resort, you could manually back up your important documents, libraries, and so on to an external drive.
Once any of these downloads finishes, do not open the installer to begin the installation. Leave the installation app in your Applications folder. Once any of these downloads are complete, mount the. DMG file and run the. PKG installer within. This will put an installation app in your Applications folder, which you should leave there. If you have a valid Apple Developer account, you might be able to download older versions from developer. Apple will email you an unlock code, which you can redeem in the Mac App Store.
Some websites might offer old versions of OS X for download, but we recommend avoiding them. First, the installer might contain malware.
Second, there are legal concerns: OS X is still copyrighted software. Even if you own a license, you might not be able to legally download it in your jurisdiction. If you can, you might not be able to legally use BitTorrent to download it, as your BitTorrent client will be uploading parts of OS X to other people during the download process. You can change various parts of this command to suit your own circumstances, with the main one being the name of the installer.
Be aware that any spaces will need to be preceded by a backslash. You can run the ls command to list all connected volumes, which will include your USB installation medium in case you need to check the label.
First, insert your USB drive and turn off your Mac. They are as follows:. Open the disk image, then open the. It installs an app named Install [ Version Name ]. Open that app from your Applications folder to begin installing the operating system. Check compatibility The version of macOS that came with your Mac is the earliest version it can use.
To confirm compatibility before downloading, check the minimum hardware requirements: macOS Big Sur 11 hardware requirements macOS Catalina Click and installation will begin. As a security measure, check the free space amount on your hard. Otherwise, the installation will fail. Restart your computer, and during the booting enter to Recover menu. If the computer fails to boot, create an external startup disk; restart your computer is safe mode and try to reinstall macOS High Sierra.
A stable release of macOS High Sierra will avoid any random crashes. The previous version bugs are eliminated, new features are added. Some security flows appeared in macOS Sierra; people can log as administrator, with no password. If you are signed with an Apple Developer account, you can get access to products that are no longer listed on the App Store.
If you desperately need a lower OS X version build, consider creating a new Developer account among other options. Nevertheless, keep in mind that if you visit developer. Buy a boxed edition of Snow Leopard The email edition comes with a special download code you can use for the Mac App Store. So, here are main steps you should take:. Update to Download El Capitan here.
If you have a newer Mac, there is no physical option to install Mac OS versions older than your current Mac model. But as it often happens, workarounds are possible. There is still a chance to download the installation file if you have an access to a Mac or virtual machine running that operating system.
For example, to get an installer for Lion, you may ask a friend who has Lion-operated Mac or, once again, set up a virtual machine running Lion. Then you will need to prepare an external drive to download the installation file using OS X Utilities.
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