it started to download but it pause and now I can not get it to download
download El Capitan
Try holding the option/alt key and clicking on the "Waiting" button. This should allow you to cancel it and begin again.
If that doesn't work, you need to set the catalog again with the following command in Terminal:
sudo softwareupdate --set-catalog https://swscan.apple.com/content/catalogs/others/index-10.11seed-10.11-10.10-10.9-mountainlion-lion-snowleopard-leopard.merged-1.sucatalog.gz