Elias spent weeks scouring the internet. While Apple still officially hosts many of its older installers through the Mac App Store , finding a pristine .iso of version was a different challenge. Most official downloads come as .app files, meant to be run on a live system, but Elias needed a bootable image for his specialized virtualization project.
mv ~/Desktop/HighSierra.iso.cdr ~/Desktop/macOS_HighSierra_10.13.5.iso macos high sierra 10.13.5.iso
# Create a disk image from the installer hdiutil create -o /tmp/HighSierra -size 8500m -volname HighSierra -layout SPUD -fs HFS+J Elias spent weeks scouring the internet