Apple maintains a legacy support page that hosts direct .dmg files for OS updates, but these are usually (updating from 10.13 to 10.13.6) rather than the full 10.13.6 clean installer.
Open Terminal and paste the following:
: If you already have an earlier version of High Sierra (like 10.13.5), you can download the 10.13.6 Combo Update or the standard 10.13.6 Update directly as a DMG/PKG from Apple. Creating a DMG or Bootable Installer Download Mac Os High Sierra 10.13.6 Dmg
Before running the installer, disconnect from Wi-Fi (Ethernet too). Open Terminal and set the date back to when High Sierra was signed: Apple maintains a legacy support page that hosts direct
It's important to start with a : Downloading macOS installers from third-party websites (any site not owned by Apple) carries significant security risks. The official and safest way to get macOS High Sierra 10.13.6 is through Apple’s support page or your purchased history in the App Store. Open Terminal and set the date back to
Once finished, a file named Install macOS High Sierra.app will be sitting in your folder.
