Ahh - after I log in it fails. That may be because I get a redirect because I haven't bought any credit. I think the reason I was seeing the plain url is simple - I'd stored it as well as the tor service one and it was that one I must have clicked by mistake...
I imagine it all works OK if you have a premium account. It seems that freeloaders using this site don't get everything free after all
As the NZB files are available from umpteen other sources anyway it all seems a rather pointless exercise to me.