Download macOS using Safari on your Mac
Safari uses these links to find the old installers in the App Store. After downloading from the App Store, the installer opens automatically.

macOS Monterey Watch Video:

macOS Big Sur 11 can upgrade Sierra or later
https://apps.apple.com/us/app/macosb...

macOS Big Sur 11 Hardware Requirements:
https://support.apple.com/kb/sp833?lo...

macOS Catalina 10.15 can upgrade Mojave, High Sierra, Sierra, El Capitan, Yosemite, Mavericks Download Link:
https://apps.apple.com/us/app/macosc...

macOS Catalina 10.15 Hardware Requirements:
https://support.apple.com/kb/HT210222

macOS Mojave 10.14 can upgrade High Sierra, Sierra, El Capitan, Yosemite, Mavericks, Mountain Lion Download Link:
https://apps.apple.com/us/app/macosm...

macOS Mojave 10.14 Hardware Requirements:
https://support.apple.com/kb/SP777

macOS High Sierra 10.13 can upgrade Sierra, El Capitan, Yosemite, Mavericks, Mountain Lion Download Link:
https://apps.apple.com/us/app/macosh...

macOS High Sierra 10.13 Hardware Requirements:
https://support.apple.com/kb/SP765

Safari downloads the following older installers as a disk image named InstallOS.dmg or InstallMacOSX.dmg. Open the disk image, then open the .pkg installer inside the disk image. It installs an app named Install [Version Name]. Open that app from your Applications folder to begin installing the operating system.

macOS Sierra 10.12 can upgrade El Capitan, Yosemite, Mavericks, Mountain Lion, or Lion Download Link:
http://updateshttp.cdnapple.com/201...

macOS Sierra 10.12 Hardware Requirements:
https://support.apple.com/kb/SP742

OS X El Capitan 10.11 can upgrade Yosemite, Mavericks, Mountain Lion, Lion, or Snow Leopard Download Link:
http://updateshttp.cdnapple.com/201...

macOS El Capitan 10.11 Hardware Requirements:
https://support.apple.com/kb/SP728

OS X Yosemite 10.10 can upgrade Mavericks, Mountain Lion, Lion, or Snow Leopard Download Link:
http://updateshttp.cdnapple.com/201...

macOS Yosemite 10.10 Hardware Requirements:
https://support.apple.com/kb/SP711

OS X Mavericks 10.9 NO DOWNLOAD LINK

OS X 10.8 Mountain Lion can upgrade Snow Leopard 10.6.8, Lion 10.7 Download Link:
https://updates.cdnapple.com/2021/ma...

macOS Mountain Lion 10.8 Hardware Requirements:
https://support.apple.com/kb/DL2076?l...

OS X 10.7 Lion can upgrade Snow Leopard 10.6.6 or later Download Link:
https://updates.cdnapple.com/2021/ma...

macOS Lion 10.7 Hardware Requirements:
https://support.apple.com/kb/DL2077?v...

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