Just arrived here because:
My Trainz is insisting that there is an update available but it won't download....
Main Screen shows Content Updates 1, and the NYC FL9 is the one. Click download and it tries, goes red, and if I mouse hover over it I see "Connection to the server was interrupted"
FWIW I just did a database repair for other reasons, and THAT told me I had 122 updates to download - 121 downloaded no problem, leaving only this one.