The query’s phrasing ( 10136 , dmg ) suggests a lack of familiarity with modern macOS distribution methods. Apple does not provide direct High Sierra DMGs. The safest, fastest, and most reliable method is the softwareupdate terminal command. If that fails due to expired certificates, use community-maintained Apple catalog tools – third-party DMG repositories without checksum verification.

If you have an official DMG (trusted)

Her phone buzzed. A coworker: “Did you get the Figma handoff?”