# Create a blank disk image (6GB) hdiutil create -o /tmp/HighSierra -size 6000m -volname HighSierra -layout SPUD -fs HFS+J hdiutil attach /tmp/HighSierra.dmg -noverify -mountpoint /Volumes/HighSierra Copy installer files to the mounted image sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/HighSierra --nointeraction Unmount and convert to ISO/CDR hdiutil detach /Volumes/Install\ macOS\ High\ Sierra hdiutil convert /tmp/HighSierra.dmg -format UDTO -o ~/Desktop/HighSierra Rename the .cdr to .iso mv ~/Desktop/HighSierra.cdr ~/Desktop/HighSierra.iso
If you need a bootable ISO of macOS High Sierra for a virtual machine (like VMware or VirtualBox) or a USB installer, follow this guide. Do not download pre-made ISOs from untrusted sources. mac os high sierra iso file download
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