Once you download InstallMacOSX.dmg , you cannot use it immediately to create an ISO. You must first extract the .app installer: Double-click the to mount it. Open the mounted volume and run the .pkg installer inside.
Elena had just found her old 2011 MacBook Pro in the attic. It still booted, but the hard drive had been wiped clean. "I just need El Capitan," she whispered. "That's the last version this machine can run smoothly." mac os x 1011 el capitan iso download link
You can download the official El Capitan disk image directly from Apple using a web browser (Safari is recommended): Once you download InstallMacOSX
