Yes, there were a lot of missing assets for me as well, from a new purchase direct from JR and install from about a week ago. I was able to download everything missing from the DLS and a 52 ft car from JR. There was one faulty asset in particular, a rockslide detector fence, that I could not fix or find a non-faulty copy of. I deleted it. But then the route shows missing dependency kuid2:124017:20110:4. I can't remember if that's the kuid of the fence, but a search for that kuid turns up nothing. Everything else is fine on my install now.
I have to say that when I pay for a route or any other content, I want all the dependencies necessary for that content to be included in that content. Luckily, I had a FCT from getting the Platinum package, but if I had to buy a FCT so I could download all those missing assets at more than 10 bytes/sec, I would be quite miffed.
So, far, although I love some things about Trainz, I have to say that the notion that there's half a million free assets available is misleading. Even if you pay to have unthrottled access, most of those assets are old, and I've yet to find more than a few that are worth downloading, if we're talking about routes or sessions. I suppose for those that just want rolling stock and locos, or assets to build their own routes, it might be a rosier picture.
Perusing these forums suggests that this product is kind of a pseudo-model train hobby, where lots of folks build beautiful routes (judging from their pictures) and never let anyone else have them. Each person seems to work on their own build. That's fine, I guess, but a bit odd as well. I suspect that the trouble of finding and packaging all the assets one uses to build a route, given the arcane file structure of this product, is discouraging of the impulse to share. Sad, really. I've seen some incredibly realistic and beautiful routes in screenshots, but what is generally available, including almost all of the N3V routes, are sad cartoons.
This Coal Country route is an exception. It's beautiful, and incredibly well thought out. I'm hoping to see more like this from JR or somebody in the not too distant future.