To create a working bootable ISO image of , you must first obtain the official installer application and then use the macOS Terminal to convert it from its native format into an ISO. This is commonly required for installing the operating system on virtual machines like VirtualBox or VMware . 1. Obtain the El Capitan Installer
Getting Your Mac OS X El Capitan ISO to Work: A Complete Guide Trying to find a reliable macOS El Capitan 10.11.1 ISO image macosxelcapitan10111imageiso work
Added rich content support, including checklists and integrated Maps locations. System Requirements for Installation OS X El Capitan 10