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I also have it sometimes - workshop also downloa and stops at a random % (like 32% downloading progress) and then it finishes instantly and the downloaded addon is nowhere to be found.
I can't do anything on it.. Let's just hope they fix it, in the meanwhile you can download it and install manually from http://www.l4dmaps.com/details.php?file=27024
I will release an update soon on both l4dmaps and here, if it still doesn't work after update then i'm pretty sure it's not something I can do about.
Try create a survival lobby and see if you can find the map. Workshop tends to skip downloading at times, so I assume you can try again later.