Finding a high-quality is essential for users with older Mac hardware that cannot run newer versions like Ventura or Sonoma. Released as the final stable update for High Sierra, version 10.13.6 introduced critical stability fixes and AirPlay 2 support for iTunes . Official Ways to Get macOS High Sierra
If the MD5 didn't match the master record, the DMG would mount, but the installation would fail at 80%, leaving the target machine a brick. macos high sierra 10136 dmg high quality