From the readme:
Worn Tiger V.1
This is a reskin of the Tiger I tank from Day of Defeat: Source. It has a
custom metal texture added by me and some little details like the Tiger division
cross on the turret and the Tiger I symbol on the left front side.
I do not mind if you use this as a base for your skins as long as you credit
me if it's released.
Simply drop the materials folder in:
C:/Program Files/Valve/Steam/SteamApps/youremail/day of defeat source/dod
If it asks to overwrite, choose "Yes to all." If you wish to uninstall, simply
remove the files from the props_vehicles folder.