BBC iPlayer Download failure

I think this is solved with Energy Saver at 'Never'

Original question was:

'Is there a way to prevent my iMac going into power save mode when downloading stuff? If I am working at my desk it all works fine but, if I go away, it stops.'

Yes, that should fix it. But what has that to do with the subject line?

All downloads are going to stop when the computer goes to sleep.
Downloads will not prevent a computer from going to sleep the way watching a movie will.