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Keep older Macs running on a stable, supported OS version.
This is the standard, free method using the official createinstallmedia command.
macOS Catalina dropped support for 32-bit applications completely. It runs natively on the following Mac models: Early 2015 or newer MacBook Air: Mid 2012 or newer MacBook Pro: Mid 2012 or newer Mac Mini: Late 2012 or newer iMac: Late 2012 or newer iMac Pro: All models (2017) Mac Pro: Late 2013 or newer How to Create a Bootable USB Installer hot download macos catalina 10157 dmg
Once you have your DMG file or installer ready, follow these steps:
This error usually occurs due to a corrupted download or an expired certificate. Set your system date back to a date around October 2020 using Terminal before attempting installation. Keep older Macs running on a stable, supported OS version
This happens if you attempt to use the command-line fetch tool on an OS version older than Mojave, or if Apple's catalog servers are undergoing maintenance.
When downloading DMG files from third-party sources, it's crucial to verify their integrity. Here are the checksums for authentic macOS Catalina 10.15.7 DMG files: It runs natively on the following Mac models:
: If you are already on a Mac running Mojave or later, open Terminal and use this command to download the full installer: softwareupdate --fetch-full-installer --full-installer-version 10.15.7 .