Can you find it here: http://www.auran.com/TRS2004/DLS.php and hit "Download", "Download Pack", and scroll to Detailed/Download the 2 dependency's at he bottom of the pack ?
G'Day, as your versions of trainz are now unsuported N3V have discontinued DLS access for those versions. You will need to either purchase a newer version of trainz or an FCT (which is quite cheep) to access the DLS.
I still use TRS06 and can still access the DLS at great download speeds with CMP as I have a FCT and newer versions, so it is well worth the small investment.
Regards
Barrie