That would only work if you happen to have 2012 registered though, which kind of defeats the purpose - if you don't have 2012 and you try searching for 2012 content on the Black Pages, all download links are replaced by 'TS12 serial code required' icons, including FTP. I just checked the Black Pages and that's what came up for me doing just such a search. Searching the DLS through CMP doesn't give you that choice either.
I'm sorry if I've came across as harsh, and I know you're trying to help, but the fact of the matter is, as has been stated on the DLS main page since the beginning, "you will only be able to download content from the same or earlier versions of Trainz that you have registered."