How to Download Full MacOS Installer from Mac Command Line

How to Download Full MacOS Installers

// Mac OS Big Sur 11.2.3:
http://swcdn.apple.com/content/downloads/12/32/071-14766-A_Q2H6ELXGVG/zx8saim8tei7fezrmvu4vuab80m0e8a5ll/InstallAssistant.pkg

// Mac OS Catalina 10.15:
https://itunes.apple.com/us/app/macos-catalina/id1466841314?ls=1&mt=12

// Mac OS Mojave 10.14:
https://itunes.apple.com/us/app/macos-mojave/id1398502828?ls=1&mt=12

// Mac OS High Sierra 10.13:
https://itunes.apple.com/us/app/macos-high-sierra/id1246284741?ls=1&mt=12

// MacOS Sierra 10.12:
http://updates-http.cdn-apple.com/2019/cert/061-39476-20191023-48f365f4-0015-4c41-9f44-39d3d2aca067/InstallOS.dmg

// OS X El Capitan 10.11:
http://updates-http.cdn-apple.com/2019/cert/061-41424-20191024-218af9ec-cf50-4516-9011-228c78eda3d2/InstallMacOSX.dmg

// OS X Yosemite 10.10:
http://updates-http.cdn-apple.com/2019/cert/061-41343-20191023-02465f92-3ab5-4c92-bfe2-b725447a070d/InstallMacOSX.dmg

// OS X Mavericks 10.9
https://apps.apple.com/us/app/id675248567?mt=12
// Install mas-cli:
brew install mas
// Or with MacPorts:
sudo port install mas
// Download Mavericks with mas-cli. Previous download may be required:
mas install 675248567

// OS X Mountain Lion 10.8:
https://support.apple.com/kb/DL2076?locale=en_US

// OS X Lion 10.7:
https://support.apple.com/kb/DL2077?locale=en_US

There's a free app that does that

It also lets you download macOS installers directly from Apple's CDN