If your Mac is newer than 2020, it is likely incompatible; you should be running a more recent OS. For unsupported older Macs, tools like OpenCore Legacy Patcher may allow installation, but that is an advanced process.
This method is specific to older macOS versions like High Sierra, as their installer contains a InstallESD.dmg file which can be restored directly.
: Double-click the downloaded .dmg file to open it. If it contains a .pkg file, double-click that to extract the "Install macOS High Sierra" app to your Applications folder. Format Your Drive : Insert a USB drive (minimum 16GB). Open Disk Utility , select your drive, and click Erase . download macos high sierra 10.13 6 dmg file
You can download the macOS High Sierra 10.13.6 update from Apple's official website:
softwareupdate --fetch-full-installer --full-installer-version 10.13.6 Use code with caution. Press . If your Mac is newer than 2020, it
Download and install a utility like or BalenaEtcher .
If you are on a newer Mac (like Apple Silicon) that refuses to download older installers through the App Store, you can use an open-source tool like Mist from GitHub . It downloads official firmware and installers directly from Apple's servers. How to Create a Bootable USB Installer : Double-click the downloaded
High Sierra (10.13.6) remains a stable, reliable OS for legacy hardware, offering the final support for many 32-bit applications and older peripherals. This guide provides reliable methods to acquire the official DMG/installer, including the final 2020 security updates.
: macOS High Sierra 10.13.6 stopped receiving security updates in November 2020. Using it exposes you to known vulnerabilities.