Macos High Sierra 10.13 6 Iso Download ((better)) Link

Remember: High Sierra is no longer supported by Apple, meaning security vulnerabilities found today will never be patched. Only use this OS offline or for legacy software that never touches the internet.

The full installer is approximately 7.7GB to 8GB. Once finished, it will appear in your Applications folder.

from the official installer (legitimate method):

Copy Files: sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/HighSierra --nointeraction