Once you have downloaded the DMG file, you will likely need to create a bootable USB drive to perform a clean installation.
: You can download the full macOS High Sierra 10.13.6 installer directly from Apple Support . Clicking "Get macOS High Sierra" redirects you to the App Store, where you can download the 5.2GB installer app.
Downloading macOS High Sierra 10.13.6 via Google Drive is a common alternative when official Apple channels are difficult to access, though it carries inherent security risks. While various community-shared links exist, users often encounter issues with expired certificates or incomplete files. Microsoft Community Hub Key Download Options
John was impressed by the community's resourcefulness and willingness to help each other out. He decided to join the community and contribute his own knowledge and expertise.
for quick access, it is always safer to use official or verified methods to ensure the file hasn't been tampered with.