sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/Untitled Use code with caution. Press and type your password. Press Y to confirm you want to erase the drive.
Flash the installer files into the blank image (you will need to type your Mac's login password): download macos high sierra 10.13.6 dmg mac
Name your file, choose the destination saving path, and set the Image Format to . Click Save to generate your official DMG file. How to Create a Bootable USB Installer from the DMG sudo /Applications/Install\ macOS\ High\ Sierra
This is why you need a direct containing the installer. A DMG (Disk Image) allows you to bypass Apple’s certificate expiration issues by letting you extract the installer manually, change the system date, or create a bootable USB drive. Flash the installer files into the blank image
Download the InstallAssistant.pkg file on a compatible Mac. Open the package and follow the prompts. It extracts the official Install macOS High Sierra.app directly into your /Applications folder. 2. Mac App Store Route
MacOS High Sierra 10.13.6 includes various security features to protect your Mac and data:
Apple delivers the OS as an .app file ( Install macOS High Sierra.app ). If you specifically need a .dmg (Disk Image) format for archiving, flashing, or virtual machine software (like VirtualBox or VMware), you can build it yourself using Terminal.