How to download macOS - Apple Support
support.apple.com › en-us › HT211683Oct 24, 2022 · Follow the onscreen instructions to install macOS. Click the link to download a disk image (.dmg) file for that macOS. Double-click the .dmg file to open it and see the .pkg file within. Double-click the .pkg file, then follow the onscreen instructions. This installs the macOS installer into your Applications folder.