Before we dive into the download process, let's quickly explain what a DMG file is. A DMG file, short for Disk Image, is a file format used by macOS to distribute software, including operating systems. It's essentially a mountable disk image that contains the installation files for macOS High Sierra.
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: Supports most Macs introduced in late 2009 or later, including: MacBook (Late 2009 or newer) MacBook Air/Pro (Mid 2010 or newer) iMac (Late 2009 or newer) Mac Mini (Mid 2010 or newer). Creating a Bootable USB Installer download macos high sierra 1013 6 dmg file link