[ns] daily snapshot??

I am new to ns.I got seg-faults with the wireless2 and wireless3.tcl examples in the marc greiss' tutorial..In the ns pages, I found a statement that a bug was fixed and the daily snapshots after some specific date should be used...I went to the ns home page and couldn`t find a way to download a daily snapshot..Where exactly can I get the daily snapshots for particular dates?..And, it did not mention which particular files should be updated..Any info on how to fix this problem wold be greatly appreciated...