macOS High Sierra is often described as the "Snow Leopard" of its generation—a refinement release. While it introduced major under-the-hood technologies like APFS (Apple File System) and HEVC video support, the user interface remained largely unchanged from macOS Sierra.
To install macOS High Sierra 10.13.6 using a DMG file, you need to download the official installer, prepare a bootable USB drive, and then execute the installation. This guide covers how to do this on a Mac or a Windows PC. macos high sierra 10136 dmg install