Even with a perfect ISO, you may encounter problems. Here are the solutions.

This uses Apple’s built-in hdiutil and asr (Apple Software Restore).

Step 1: Create a blank read/write disk image (CDR)

hdiutil create -o /tmp/HighSierra -size 6500m -volname macOS -layout SPUD -fs HFS+J

Note: The installer requires ~5.2GB, but we allocate 6.5GB to be safe.

Step 2: Mount the blank image

hdiutil attach /tmp/HighSierra.dmg -noverify -mountpoint /Volumes/macOS

Step 3: Restore the installer onto the blank image

sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/macOS --nointeraction

This command turns the blank volume into a bootable macOS installer.

Step 4: Unmount the volume

hdiutil detach /Volumes/Install\ macOS\ High\ Sierra

Step 5: Convert the .dmg to .iso (compatible for all systems)

hdiutil convert /tmp/HighSierra.dmg -format UDTO -o ~/Desktop/macOS_High_Sierra_10.13.6.iso
mv ~/Desktop/macOS_High_Sierra_10.13.6.iso.cdr ~/Desktop/macOS_High_Sierra_10.13.6.iso

The final file will be on your Desktop as macOS_High_Sierra_10.13.6.iso.

Although Apple releases new macOS versions annually, older operating systems often retain a dedicated following among IT professionals, developers, and retro-tech enthusiasts. Among these, macOS High Sierra (10.13.6) stands out as a pivotal release.

For users looking to run this OS in a virtual environment or on older hardware, the search term "macOS High Sierra 10.13.6.iso" is a common query. This article explores why this specific file format is sought after, the legalities of downloading it, and how to use it safely.