Most modern macOS updates are handled through the System Preferences, but High Sierra is different. The standard installer from the App Store often fails on older machines or refuses to download on newer macOS versions like Ventura or Sonoma.
You specifically need the DMG (Disk Image) or the InstallESD.dmg file if: download+macos+high+sierra+10136+dmg+mac+install
Cause: Expired certificate. Apple stopped signing High Sierra in 2020.
Fix: Open Terminal and set the date back during installation: Most modern macOS updates are handled through the
The user seeks to locate, download, and install a specific legacy macOS version (High Sierra 10.13.6). This request faces three primary challenges: Apple’s removal of direct DMG links from public directories, the transition away from outdated package formats (DMG for full OS installers), and hardware compatibility constraints. Cause: Expired certificate
sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/HighSierra --nointeraction
You’ll end up with HighSierra.dmg on your Desktop, mountable and bootable.