Guides
Step-by-step help for downloading, installing and downgrading macOS.
Which macOS can my Mac run?Find the newest and oldest macOS versions your Mac supports, by model and year.Download any macOS installer with TerminalUse Apple's built-in softwareupdate command to download full macOS installers without upgrading.How to create a bootable macOS USB installerReady-to-paste createinstallmedia commands for every macOS version from Mavericks onward.Reinstall or downgrade with macOS RecoveryUse the Recovery system built into your Mac to reinstall the current, latest or original macOS.Fix “This copy of the installer is damaged”Why old macOS installers fail with expired-certificate errors, and how to fix them.Trusted tools for downloading macOSMist, Mr. Macintosh, softwareupdate and Apple's own pages: safe places to get macOS installers.