⚠️ : High Sierra is now obsolete (final update was 10.13.6 in 2018). Apple no longer provides security patches. Only use it on older Macs that cannot run newer macOS versions.

The macOS High Sierra 10.13.1.dmg is a disk image file containing the installer for . This was a minor update to the initial High Sierra release (10.13), focusing on bug fixes, security patches, and compatibility improvements.

This was a massive change. It changed how data was stored, cloned, and encrypted. High Sierra 10.13.1 was the first major stability patch for this new file system. For anyone running hardware from that era—think MacBook Pros from 2015-2017—this specific DMG is often the "gold standard" for a clean installation that feels snappy and reliable.

: A vital fix for the KRACK (Key Reinstallation Attack) Wi-Fi vulnerability was included to protect users on public networks.