(Note: These commands require precise execution and may vary slightly depending on the installer version.)
Apple does not officially provide "ISO" files for macOS; instead, they offer a full installer app through the Mac App Store. If you specifically need an ISO for a virtual machine or a custom bootable tool, you must first download the installer and then convert it using the Terminal. Download from App Store : You can find the direct link to the High Sierra App Store page in official support documents. It is best to use
: If you are on a Mac, you can use Terminal commands to create a blank disk image, mount it, use the createinstallmedia tool to copy the installer, and then convert that image to an .iso format.