Apple provides the full installer for High Sierra via a specific link that redirects to the App Store .
Once you have the installer:
Note: This downloads the installer application, not a DMG file directly. Follow the steps below to convert it if necessary. download macos high sierra 10136 dmg mac top
The latest full version of macOS High Sierra (10.13.6) is primarily available through the rather than as a direct DMG download from Apple’s support site . 🛠️ Official Download Methods Apple provides the full installer for High Sierra