I can't download El Capitan
I tried to install El Capitan when it was first released, but it would not complete installation. I rebooted to Yosemite (10.10.5) OK. Now I try to download the latest version of El Capitan (10.11.1) from the Mac App Store. I press the 'download' button and I get the waiting symbol for several hours, but no download. I have checked the Applications Folder to see if it has downloaded anyway and it hasn't. I have 1.6TB of space available on my hard drive. I have no problems downloading any other updates and have done so today. Any ideas how I can get El Capitan 10.11.1 to download?
iMac, OS X Yosemite (10.10.2)