Close Disk Utility and choose Install macOS . Follow the on-screen instructions to select your newly formatted drive. Troubleshooting & Tips
This error occurs because Apple’s old security certificates built into the installer have expired. You can bypass this easily: macos high sierra 10136 dmg install
To create a bootable installer, you'll need a USB drive with at least 8GB of free space: Close Disk Utility and choose Install macOS
© 2026 — Complete Guide to macOS High Sierra 10.13.6 DMG Installation. Always refer to Apple’s official support documentation for the most current security updates and compatibility information. You can bypass this easily: To create a
Brings faster performance, better security, and improved data reliability to solid-state drives (SSDs).
The process involves creating a bootable USB installer (as described above), then running OCLP on the USB drive to apply the necessary patches. After booting from the patched USB, you can install High Sierra on your unsupported Mac.
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