"So, you have viewed your errors - then what??"
Then you know what your errors are, of course! :hehe:
Seriously, there's a sticky link about how to fix errors, but there's too much to wade thru without hip boots. Best way;
http://forums.auran.com/trainz/showpost.php?p=823910&postcount=6
Start a new thread, copy and paste the KUID number of the asset with the errors, copy and paste the messages, after that any techy type can duplicate the problem and walk you thru the steps to fix it. Once you have done a few of them you'll be able to figure out more yourself.
As for missing dependencies, select the asset with the "puzzle piece";
http://forums.auran.com/trainz/showpost.php?p=808146&postcount=4
Right click, View Dependencies, in that window select View in main list. Now the simple way is CTRL A to select all, right click and select Download, hope the download helper is in a good mood and won't get the hiccups trying to sort what's already installed from what needs to be downloaded. If it chokes, try again, this time selecting only the ones with the DS icon instead of the local or built in icon, download a few at a time.
Whichever way it works, it's rarely done yet, the route or whatever is still showing the puzzle piece, so now go to the filter and select missing dependencies=true. What you'll find is that dependencies of dependencies fail to download automatically - for example a session needs a loco so it shows the missing dependency icon, download the loco and the session STILL shows the missing dependency icon, nothing is missing but the loco has a missing dependency of its own, the download helper failed to get the bogies or cabview.
Occasionally you'll get a question mark with a KUID number, that indicates a dependency that can't be found on the download station. Any asset that shows that it would be advisable to just delete it for now, wait until you got the hang of fixing the normal stuff before going on to complicated games like "google the KUID".