How to Install Older Version of Mac Os

Joel Mason

Mac, Tutorials

How to Install Older Version of Mac OS

Are you looking to install an older version of macOS on your Mac? Whether it’s for compatibility reasons or personal preference, installing an older version of the operating system can be useful. In this tutorial, we will guide you through the step-by-step process of installing an older version of macOS on your Mac.

Before You Begin

Before you proceed with the installation, there are a few things you need to consider:

  • Compatibility: Check if your Mac is compatible with the older version of macOS you intend to install. Apple provides a list of supported models for each macOS release on their website.
  • Data Backup: Back up all your important files and data.

    Installing a new operating system can potentially erase your existing data, so it’s essential to have a backup.

  • Download the Installer: Locate and download the installer for the specific version of macOS that you want to install. You can find official Apple installers on their website or other trusted sources.

The Installation Process

Step 1: Create a Bootable Installer

The first step is to create a bootable installer for the older version of macOS. Follow these steps:

  1. Connect a USB Drive: Connect a USB drive with sufficient storage capacity to your Mac.
  2. Format the USB Drive: Open Disk Utility (you can find it in Applications > Utilities), select your USB drive from the sidebar, and go to “Erase”. Choose “Mac OS Extended (Journaled)” as the format and give it a suitable name.
  3. Create the Bootable Installer: Open Terminal (you can find it in Applications > Utilities) and enter the command: sudo /Applications/Install\ Older\ --volume /Volumes/[YourUSBDriveName] --applicationpath /Applications/Install\ Older\ (replace [YourUSBDriveName] with the name of your USB drive).
  4. Wait for the Process to Complete: The process may take a while. Once it’s done, you will have a bootable installer on your USB drive.

Step 2: Start the Installation

Now that you have a bootable installer, you can proceed with the installation:

  1. Restart Your Mac: Restart your Mac while holding down the Option key.
  2. Select the Bootable Installer: When prompted, select the bootable installer from the list of available startup disks and press Enter.
  3. Follow the Installer Instructions: The installation process will begin. Follow the on-screen instructions to select your language, agree to terms, and choose the destination disk where you want to install macOS.
  4. Wait for Installation to Complete: The installation process may take some time. Your Mac will restart automatically once it’s finished.


You have successfully installed an older version of macOS on your Mac. You can now enjoy using the specific features and functionalities that come with that version.

Note: It’s important to keep in mind that running an older version of macOS may have security implications. Make sure to update your software regularly to stay protected.

That’s it! Now you know how to install an older version of macOS on your Mac.

Remember to always double-check compatibility and backup your data before proceeding with any major system changes. Enjoy exploring the older macOS!

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