macOS Catalina 10.15 can upgrade Mojave, High Sierra, Sierra, El Capitan, Yosemite, Mavericks.After downloading from the App Store, the installer opens automatically. Safari uses these links to find the old installers in the App Store. OS X Yosemite 10.10 hardware requirements.OS X El Capitan 10.11 hardware requirements.macOS Sierra 10.12 hardware requirements.macOS High Sierra 10.13 hardware requirements.macOS Mojave 10.14 hardware requirements.macOS Catalina 10.15 hardware requirements.To confirm compatibility before downloading, check the minimum hardware requirements: For example, it might say that it's not compatible with this device or is too old to be opened on this version of macOS. If a macOS can't be used on your Mac, the App Store or installer will let you know. For example, if your Mac came with macOS Big Sur, it will not accept installation of macOS Catalina or earlier. The version of macOS that came with your Mac is the earliest version it can use. Instructions on how to do that are on the Internet/Youtube. A bootable ISO or bootable USB can be made from this installer. Un-archive the zip archive and you will get the app Installer.
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