After download, run in Terminal:
The final update, , introduced AirPlay 2 support for iTunes and various stability fixes for Mail and Photos. Today, it remains a critical release because it is the final supported version for several legacy Mac models, including the Mid-2010 MacBook Pro and Late-2009 MacBook. Third-Party Distribution: The "Google Drive" Phenomenon --- Macos High Sierra 10.13.6 Dmg Google Drive
Many users search for DMG files on third-party platforms like Google Drive After download, run in Terminal: The final update,
The installer’s certificate has expired. Apple code-signs all installers, and the certificate for High Sierra expired in October 2019. run in Terminal: The final update