Steps:

A. Copy materials folder
B. Paste materials folder in Program Files/Steam/Steamapps/common/left 4 dead/left 4 dead
C. Download Notepad++. If you already have, skip to step D.
D. Open pak01_dir.vpk with Notepad++
E. Press Ctrl+F and type in "hunter_01"
F. Press enter to get to the second "hunter_01"
G. Replace "hunter_01" with "hunter_02"
H. Masturbate to the fact that you got it working.
