You can access the macOS High Sierra App Store page to download the full installer app directly to your Applications folder.
Technical enthusiasts often need the DMG (disk image) to create bootable USB installers for reviving older Macs that cannot access the modern App Store or recovery servers. Official Ways to Secure the DMG Download Mac Os High Sierra 10.13.6 Dmg
Downloading macOS installers from unofficial sites (Torrents, MediaFire, random tech blogs) carries serious risks: You can access the macOS High Sierra App
You might want to download macOS High Sierra 10.13.6 DMG for several reasons: Download Mac Os High Sierra 10.13.6 Dmg