Mac OS High Sierra DMG is a disk image file that contains the installation files for Mac OS High Sierra. The DMG file is a compressed file that can be mounted on a Mac computer, allowing users to install the operating system. The file is typically used by developers, IT professionals, and users who want to perform a clean installation of the operating system.

If you obtain a DMG from any source (which you then package yourself), verify its integrity:

Launch the default browser on a compatible Mac computer.

To install Mac OS High Sierra, your Mac computer must meet the following system requirements:

: Some models need a firmware update before installing High Sierra.

for High Sierra (last update: 2020). Running it on an internet‑connected machine is not recommended for daily use due to unpatched vulnerabilities.

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