: Obtain the full macOS High Sierra installer from the Mac App Store or use a tool like Mist to download it directly from Apple's servers.
To "make paper" of macOS High Sierra 10.13, you can create a bootable installer on a USB drive. This is often referred to as a "boot disk" or "installer drive." Creating a Bootable Installer (The "Paper" Copy) macos_high_sierra_10.13
: Use apps like DiskMaker X , which automate the process through a simple interface. : Obtain the full macOS High Sierra installer