How to get old versions of macOS – Apple Support
Posted by jpluimers on 2022/03/11
Note just because of a Mac being incompatible, but also because of 32-bit apps being incompatible ruling out Cataline (10.15) or newer.
[Wayback] How to get old versions of macOS – Apple Support
If your Mac isn’t compadmgtible with the latest macOS, you might still be able to upgrade to an earlier macOS, such as macOS Catalina, Mojave, High Sierra, Sierra, or El Capitan.
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Download macOS
It takes time to download and install macOS, so make sure that you’re plugged into AC power and have a reliable internet connection.
Safari uses these links to find the old installers in the App Store. After downloading from the App Store, the installer opens automatically.
- macOS Catalina 10.15 can upgrade Mojave, High Sierra, Sierra, El Capitan, Yosemite, Mavericks
- macOS Mojave 10.14 can upgrade High Sierra, Sierra, El Capitan, Yosemite, Mavericks, Mountain Lion
- macOS High Sierra 10.13 can upgrade Sierra, El Capitan, Yosemite, Mavericks, Mountain Lion
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.
- [Wayback] macOS Sierra 10.12 (InstallOS.dmg) can upgrade El Capitan, Yosemite, Mavericks, Mountain Lion, or Lion
- [Wayback] OS X El Capitan 10.11 (InstallMacOSX.dmg) can upgrade Yosemite, Mavericks, Mountain Lion, Lion, or Snow Leopard
- [Wayback] OS X Yosemite 10.10 (InstallMacOSX.dmg) can upgrade Mavericks, Mountain Lion, Lion, or Snow Leopard
links for 10.13 and newer on the Apple site are App-Store only, so you need to download, then save the installer in a safe place.
Alternative download methods and notes on certificate expirations:
- [Wayback] Redownload Archived macOS Installers to Address Expired Certificates – TidBITS
Signing certificates for macOS installers have expired, so Apple consultants and IT admins who maintain troubleshooting toolkits containing older installers will need to download new copies.
- Via [Wayback/Archive.is] Official Apple downloads for Yosemite, El Cap and Sierra (App Store login not necessary) : hackintosh:
- [Wayback/Archive.is] dosdude1’s Personal Web Server – Software has patches to install newer macOS versions to be on older unsupported Macs; the * marked patchers can download the DMG files for you:
- *[Wayback] Info on Patcher for 10.15 macOS Catalina [Wayback] Download Patcher for 10.15 macOS Catalina
- *[Wayback] Info on Patcher for 10.14 macOS Mojave [Wayback] Download Patcher for 10.14 macOS Mojave
- *[Wayback] Info on Patcher for 10.13 macOS High Sierra [Wayback] Download Patcher for 10.13 macOS High Sierra
- [Wayback] Info on Patcher for 10.12 macOS Sierra [Wayback] Download Patcher for 10.12 macOS Sierra
- [Wayback/Archive.is] corpnewt/gibMacOS: Py2/py3 script that can download macOS components direct from Apple
- [Wayback/Archive.is] notthebee/macos_usb: A script that creates a bootable macOS installer on Linux and macOS
- [Wayback/Archive.is] macos_usb/macos_usb.sh at master · notthebee/macos_usb (uses glibMacOS to download)
- [Wayback/Archive.is] dosdude1’s Personal Web Server – Software has patches to install newer macOS versions to be on older unsupported Macs; the * marked patchers can download the DMG files for you:
–jeroen
The Wiert Corner - irregular stream of stuff 
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