KBPublisher Knowledge Base KBPublisher Knowledge Base

hdiutil attach /tmp/HighSierra.dmg -noverify -mountpoint /Volumes/install_build Use code with caution. Write the installer files into the image:

The preference pane will open and begin downloading the "Install macOS High Sierra" application.

Have you successfully resurrected an old Mac with High Sierra 10.13.6? Let me know in the comments below.

This common error occurs because Apple’s security certificates for older installers expire over time.

For users comfortable with Terminal: