If you're specifically looking for a DMG file, you might find it on third-party websites, but be cautious when downloading from unofficial sources, as they may bundle malware or other unwanted software.
You can download macOS High Sierra 10.13.6 from the Apple Support website. However, please note that Apple typically provides a macOS installer package (.pkg) instead of a DMG file. You can download the installer from Apple Support .
sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/MyUSB --application-path /Applications/Install\ macOS\ High\ Sierra.app Replace /Volumes/MyUSB with the name of your USB drive.
