How can I obtain or purchase an external El Capitan operating system to Mac that has been erased?
How can I obtain or purchase an external jump drive to install El Capitan operating system to MacBook Air that has been erased?
MacBook Air
How to create a bootable installer for macOS
This will have to be performed from a Qualifying Computer to run the version of macOS to be made on the Bootable Installer. Example : Bootable Installer of El Capitan would have to be done on a computer that Qualifies to run El Capitan
If the Apple Computer is too Old of is the Apple Computer is too New - one can not perform this action.