Ha! You've been added to the P2P blocklist for PeerGuardian, maintained at http://www.bluetack.co.uk/ Somebody thinks you're either (a) a P2P snooper or (b) a P2P poisoner. I overrode that and I am downloading the file fine now. Again, thanks for your help and sorry to waste your time on something which is not your fault. I really should have thought of this myself...
But... But... Why? We use bittorrent to distribute EB, yes... But that's hardly poisoning.