****NOTE: You will need the Left4Dead2 Addon support for this skin to work****
I had seen this skin used in some videos on YouTube and none of them provided a link or a way on how to get this skin onto L4D2. With iFenix's help, I was able to convert the L4D1 version and make it work for L4D2.
****Again, skin is not my work what so ever! Just wanted to help people out on getting this skin!****
Unzip the file and place the vpk into the following directory: steam > steamapps > common > left 4 dead 2 > left4dead2 > addons.