Mount the newly created disk image to your Mac's filesystem so you can write data to it:
This comprehensive guide will walk you through the official methods to download High Sierra, how to create your own ISO file using the Terminal, and how to safely use it for virtualization or clean installations. Why Do You Need a macOS High Sierra ISO?
Do you need step-by-step instructions for or VMware ?
You will now find a clean, verified file sitting directly on your Mac desktop, ready for use.
hdiutil attach /tmp/HighSierra.dmg -noverify -mountpoint /Volumes/install_build
Go to the storage settings, add an optical drive, and select your downloaded file.
sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/install_build --nointeraction
Final update to High Sierra — July 9, 2018.