If you are searching for a file, you are likely engaged in a specific, often frustrating, digital excavation. Unlike the modern macOS installers—which are essentially the size of a small hard drive and come as .app bundles—High Sierra represents an era where the DMG (Disk Image) was king.
If you explore the DMG contents ( /Applications/Install macOS High Sierra.app/Contents/SharedSupport/InstallESD.dmg ), you'll find a hidden APFS snapshot mechanism that verifies the system volume during the conversion — a precursor to modern sealed system volumes in macOS. macos high sierra 10136 dmg full
folder, you can create a bootable drive for clean installs or repairs: Plug in a USB drive (16GB+ recommended) and format it as Mac OS Extended (Journaled) and use the following command (replace with your USB's name): If you are searching for a file, you