Hi, You did not say which version of Trainz you are using but if you were using Trainzhelper in 2004 you should be able to go back to the DLS, click on download with Trainzhelper and it will continue the download from where it stopped. If you are using 2006 or 2009 open CMP and find the item. right click on it and select view dependancys, form the window that opens select view in main list, then download the missing dependancys.
Cheers,
Bill69