Apple provides the official installer as a DMG file rather than a standard ISO. For use with virtual machines or Windows-based tools, you can convert this DMG to an ISO after downloading. 1. Official Download Link
Follow the prompts to "install" the installer. This will place a file named into your Applications folder. 3. Converting to ISO (Terminal Method) mac os x 1011 el capitan iso download link
: hdiutil create -o /tmp/ElCapitan.cdr -size 8000m -layout SPUD -fs HFS+J Apple provides the official installer as a DMG
and run the package installer inside to place "Install OS X El Capitan" into your Applications Run Terminal Commands: mac os x 1011 el capitan iso download link