Just a word of warning. Be very careful about uploading El Capitan's latest update, OS X 10.11.1. Whilst the main El Capitan install seems tolerable in terms of issues, the update can give all sorts of problems. In my case, it froze my iMac on re-booting and resulted in the iStore doing a tedious over-install of the original El Capitan without the update. There are pages of complaints on the Apple forums about this so just beware. Resist the temptation to update and wait for the next iteration - unless you like risks! This is perhaps the worst Apple update so far and very disappointing - although not everyone has had a bad experience.