Looking for a "verified" macOS High Sierra 10.13.6 DMG can be tricky. Many third-party sites offer mirrors, but for the safety and stability of your Mac, the best way is to pull the installer directly from Apple’s own servers
: If you already have an earlier version of High Sierra (like 10.13.0) and just need the 10.13.6 update, you can download the verified Combo Update DMG directly from Apple Support Creating a Bootable DMG/USB download mac os high sierra 10136 dmg verified
: Click "Get" or "Download." This will download a file named Install macOS High Sierra.app to your Applications folder. Looking for a "verified" macOS High Sierra 10
(Replace /dev/rdisk2 with your USB identifier – use diskutil list to find it.) download mac os high sierra 10136 dmg verified