In order to play this map you will need to manually download this map from http://www.l4dmaps.com/details.php?file=78 and unzip the files and copy them to the maps folder located (Vista x64) C:\Program Files (x86)\Steam\steamapps\common\left 4 dead\left4dead\maps\
Path will be simialar on Windows XP. If you have any problems let me know and I will be more than happy to assist (If you want to play this map and i am not on the server send me a message and I will change the map for you : ) Also if you would like to see some other maps let me know and I will see what I can do.