:
Redownload the installer — incomplete downloads can trigger this error
Press , type your admin password, and confirm by typing Y . Wait for the process to reach 100%. On a Windows PC using TransMac
: Re-download the DMG file from a different source, or use a different USB port/drive to re-create the bootable installer. APFS Conversion Failures macos high sierra download dmg install
The is essential for creating bootable USB installers, performing clean installations, or reviving older Mac hardware.
Click or the download icon. The file will download directly into your /Applications folder. Method 2: Using the macOS Terminal
Your Mac must be one of the following models to officially run High Sierra: : Redownload the installer — incomplete downloads can
What it is
This is a frequent error triggered by an expired security certificate embedded in older installers.
If you are running a compatible older macOS version, you can access the download link directly through Apple's support infrastructure. APFS Conversion Failures The is essential for creating
sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume
Since macOS High Sierra is no longer receiving security updates from Apple, consider these additional measures:
Your Mac will restart several times during the setup. Keep the computer plugged into a power source and leave the USB drive inserted until the macOS setup assistant configuration screen appears.
The Mac App Store may prevent you from downloading, even with the official link.