macOS High Sierra (version 10.13.6) remains a critical operating system for users maintaining legacy hardware or software dependencies (such as 32-bit applications, which were last fully supported here before Mojave). Unlike newer macOS versions which are obtained strictly through System Preferences, High Sierra requires a specific retrieval method via the App Store or terminal command. As Apple does not provide a direct ISO download, users must convert the official installer application into an ISO image for virtualization (VMware/VirtualBox) or archival purposes.
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Are you planning to use this ISO for a or to fix an older physical Mac ? macOS High Sierra - App Store macOS High Sierra (version 10
| Step | Command (run in Terminal) | What it does | |------|---------------------------|--------------| | a | sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/Untitled --nointeraction | Writes the installer to a USB stick (optional, but ensures the installer is complete). | | b | hdiutil create -o ~/Desktop/HighSierra.cdr -size 8g -layout SPUD -fs HFS+J | Creates an empty disk image. | | c | hdiutil attach ~/Desktop/HighSierra.cdr.dmg -noverify -mountpoint /Volumes/HighSierra | Mounts the empty image. | | d | sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/HighSierra --nointeraction | Copies the installer files into the mounted image. | | e | hdiutil detach /Volumes/HighSierra | Unmounts the image. | | f | hdiutil convert ~/Desktop/HighSierra.cdr.dmg -format UDTO -o ~/Desktop/HighSierra.iso | Converts the image to ISO‑compatible format. | | g | mv ~/Desktop/HighSierra.iso.cdr ~/Desktop/HighSierra.iso | Renames the final ISO file. | A long-standing tech site that mirrors older macOS
For those needing to download macOS High Sierra 10.13.6 specifically, it's recommended to: