How to install/update MacOS using not latest version#

Use the App Store#

For macOS Mojave 10.14 or later.

• Tahoe 26 (Latest, use Software Update or Terminal)
• Sequoia 15
• Sonoma 14
• Ventura 13
• Monterey 12
• Big Sur 11
• Catalina 10.15
• Mojave 10.14
• High Sierra 10.13

Use a web browser for older versions#

Before macOS Mojave 10.14 Use these links to download a macOS disk image (.dmg) file. If these links don't work as expected, try again using Safari, which is in the Applications folder.

• Sierra 10.12
• El Capitan 10.11
• Yosemite 10.10
• Mountain Lion 10.8
• Lion 10.7

Use Terminal#

1. Make sure that your Mac is using macOS Catalina 10.15 or later.

2. Type the following command in Terminal, replacing with the latest macOS version number for the compatible macOS that you want to download:

softwareupdate --fetch-full-installer --full-installer-version <number>

• Example: softwareupdate --fetch-full-installer --full-installer-version 26.1

• Example: softwareupdate --fetch-full-installer --full-installer-version 15.7.2

• Press Return to enter the command. As macOS downloads to the Applications folder, Terminal shows the percentage installed (downloaded). If Terminal says update not found, that version of macOS is not available for your Mac. You can enter

  softwareupdate --list-full-installers
  

  to get a list of macOS versions that are currently available for your Mac.

Ref: https://support.apple.com/en-us/102662