DLS and CMP
I was able to download last night, the first time it's ever run semi-stable (although it did free on me several times, forcing me to shut it down and losing all progress).
But after reading Auran's suggestion to be very patient with Content Manager Plus, I have d/l'd any locos/cars/buildings' main file via FTP, then adding the smaller dependencies via CMP/DLS. And I add them just one at a time, let it finish downloading, then adding the next dep.
My main complaint about DLS are all of the nifty train things in there that have missing dependencies whose location is unknown. I've had to edit many a download, substituting content that couldn't be found with ones I already had. That probably means my SP locos I downloaded won't have the right engine and horn sounds, nor the BN SD40-2 the right trucks, but I can live with that if I can just get them into TRS2006.