For a "solid report" on obtaining the macOS High Sierra 10.13.6 DMG, the most reliable method is to use Apple's official channels. While many third-party sites offer DMG files, these often carry security risks; instead, you can download the installer directly to your Applications folder to create your own bootable media. Official Download Methods
Not recommended for primary machines
Frequently Asked Questions (FAQs)
If you need to perform a clean install, you can create a bootable installer using a USB drive (8GB or larger): macos high sierra 10136 dmg new
Downloading and Installing