Put the files in these directories (assuming you installed l4d on c:\)

put pak01_dir.vpk in C:\Program Files\Steam\steamapps\common\left 4 dead\left4dead
put biker folder in C:\Program Files\Steam\steamapps\common\left 4 dead\left4dead\materials\models\survivors

if survivors folder does not exsist create one then put the biker folder in it.


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