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To ensure earlier versions of the OS can be installed, you need to erase and reformat the startup drive to remove the split volume architecture used in Catalina.

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Warning :В This process will completely erase your MacвЂ™s startup drive, destroying all of its content.Д®arly versions of the Mac OS did not make use of a read-only system volume and a read-write data volume. LetвЂ™s start this section with an important notice: Once you have the bootable installer and a current backup, youвЂ™re ready to start the downgrade process.

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How to Make a macOS Sierra USB Install Drive.

Create a Bootable macOS High Sierra Install Drive.How to Create a Bootable macOS Mojave Install Drive.With the installer downloaded and the USB flash drive in hand, follow the appropriate instructions linked below: YouвЂ™ll need a USB flash driveВ with a minimum of 8 GB of storage space and preferably, but not a requirement, a USB 3.0 port. You can change the T-2 Security Chip settings from the Recovery utility. If your Mac is equipped with a T2 chip, and most current Macs are, youвЂ™ll need to check the Rocket Yard guide:ДЇollow the instructions in the T2-Equipped Macs section. Macs equipped with the T2 security chip need to have a security setting altered to allow the use of bootable external devices. T2-Equipped MacsД¬reating and using the macOS bootable installer requires your Mac to be able to start up from an external drive. There should be an option available to continue the download. Note:В You may see a warning about downloading an older version of the operating system. Do not allow it to start the install process. If the installer starts up automatically, be sure to quit the installer. You can find the installers available at:Дownload the installer of your choice.

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We can show you how to create the bootable installer, but first youвЂ™ll need to download the macOS installer from the Mac App Store. The Mac OS installers are still available from the Mac App Store, provided you know the download URL.

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If you go the clone route, make sure the cloning software you use is both APFS and macOS Catalina compatible Carbon Copy Cloner and SuperDuperВ are two good possibilities. The other option is to make a clone of the startup drive. Time Machine is one optionВ for a backup just make sure Time Machine has been run shortly before you start the downgrade. Back Up Your Current DataД«ecause of the need to erase your startup drive, the downgrade process should start with backing up all of your data. The volumes that currently house your copy of macOS Catalina will have to be erased in order to convert the two special Catalina volumes (one read-only system volume and one read/write data volume) back to a format that is usable by the earlier versions of the Mac OS. With any of the downgrade methods, youвЂ™re going to lose all the data currently on your Mac.

Use Time Machine to restore from a date when your Mac was using a previous version of the o perating system.

Reinstall a previous version of the Mac OS using the appropriate Mac OS Installer.

There are a few different ways to perform the downgrade here are two of them. What You Need in O rder to Downgrade from macOS Catalina With those caveats in mind, letвЂ™s start the downgrade process. If youвЂ™re downgrading because of macOS Catalina installation problems, be sure to check the Catalina Install Issues section near the end of this article for any special steps you may need to take. If you have ever installed that version on your Mac, no matter what version (or no version) is currently installed, you have these options.If you would like to downgrade from macOS Catalina to a previous version of the Mac operating system it can be done, but it isnвЂ™t always an easy or painless process. However, you have other keystroke options depending on which version was previously installed.ДЄpple changed the start keys with macOS Sierra version 10.12.4. (If your main macOS partition had system files become damaged or missing, your other files will remain intact, as this reinstallation only installs and replaces system files and apps.)Д¬ommand-R should reinstall the latest version of macOS that you had previously installed on this computer. When complete, it should reinstall macOS Recovery and reinstall macOS on the main partition. You should then be prompted to connect to a Wi-Fi network, and you enter a password.ДЄt this point, the Mac should start to download the recovery files from the internet and show a status bar. The Mac should recognize that thereвЂ™s no macOS Recovery partition installed, show a spinning globe. Start up your Mac from a shut down state or restart it, then immediately hold down Command-R.