The primary addition in the 10.13.6 update was support for within iTunes, allowing users to sync and control music across multiple AirPlay 2-enabled speakers.
To run macOS High Sierra 10.13.6 (17G66), your Mac should meet the following system requirements:
Featured a new persistent sidebar, professional editing tools (like Curves and Selective Color), and improved Face detection syncing via iCloud. Downloading the DMG
When users search for a "new" DMG of High Sierra, they aren't looking for new features (there are none). They are looking for a clean, untainted, final build installer. Apple released 10.13.6 in July 2018. It was the last security-patched version.
