I tried the link to the App store and when I tried to download El Cap I got the message "This version of OS 10.11 cannot be installed on this computer".
My bad! The (unread, naturally
)
small print has struck again, but in blatant and unashamed contravention of Apple's attempts to limit us to our recovery partitions I'd be happy to burn my archived copy of the El Cap installer to a double-layer DVD for you, and you can use it to create a bootable installer on a 16 GB flash drive and/or simply save it on your iMac.
