Macosxelcapitan10111imageiso Work -

hdiutil convert /Volumes/OS\ X\ Install\ ESD/BaseSystem.dmg -format UDTO -o ~/Desktop/ElCapitan10.11.1.cdr Rename the .cdr file to .iso :

/Applications/Install OS X El Capitan.app/Contents/SharedSupport/InstallESD.dmg Copy this file to your Desktop. macosxelcapitan10111imageiso work

On a Mac with the El Capitan installer app: hdiutil convert /Volumes/OS\ X\ Install\ ESD/BaseSystem