Open Terminal and create a blank DMG, then convert to ISO:
# Create a blank 12GB DMG hdiutil create -o /tmp/macOS -size 12g -layout SPUD -fs JHFS+ hdiutil attach /tmp/macOS.dmg -noverify -mountpoint /Volumes/macOS_ISO Write the installer to that volume (replace path with your .app) sudo /Applications/Install\ macOS\ Sequoia.app/Contents/Resources/createinstallmedia --volume /Volumes/macOS_ISO --nointeraction Unmount and convert DMG to ISO hdiutil detach /Volumes/Install\ macOS\ Sequoia hdiutil convert /tmp/macOS.dmg -format UDTO -o ~/Desktop/macOS.iso Rename .cdr to .iso mv ~/Desktop/macOS.iso.cdr ~/Desktop/macOS.iso macos iso
It’s important to clarify that like Windows. Apple’s official distribution method is through the App Store (as an .app installer) or Software Update , and these are not directly bootable as ISO images on non-Apple hardware. Open Terminal and create a blank DMG, then