You can find the full DMG image (approx. 4.8GB) on the Internet Archive .
Sites like Archive.org sometimes host full DMG installers. macos high sierra 10131 dmg
If you cannot use the App Store (e.g., your Mac is currently without an OS), community-vetted tools can help you fetch the official files directly from Apple’s servers to create a DMG/Installer: You can find the full DMG image (approx
Apple maintains a support page that provides direct links to open the Mac App Store for downloading various macOS versions. Visit Apple's macOS download page , find the entry for macOS High Sierra, and click the link to open the installer in the Mac App Store, if your device is compatible. if your device is compatible.