: Official support and security patches ended in November 2020 .
: Tools like createinstallmedia in the Terminal are the standard way to make a USB installer, though newer macOS versions may encounter "zsh: killed" errors when attempting to run old High Sierra installer files . 4. Upgrading Beyond 10.13.6 macOS High Sierra | Specs, reviews and EoL info - InvGate macos high sierra 10.13 6 dmg
Once you have the legitimate installer app, don’t just double-click it. To install on multiple machines or a clean drive, create a bootable USB: : Official support and security patches ended in
: Includes vital security patches to protect against modern vulnerabilities. Official Download Methods macos high sierra 10.13 6 dmg