the ready to run executable from the same developers (I love sysinternals):
http://live.sysinternals.comit's very basic to use and understand, when you execute the /download command you should see an "open" command logged by filemon with the full path of the requested file and the result: SUCCESS or NOTFOUND
if you don't see this logged request means that there is a compatibility problem between q3dirtrav and the 2.55 client