How to install:
1. Copy the 2 .vpk files (depending on if you want a custom HUD or not) and paste them to:
C:\Program Files (x86)\Steam\SteamApps\common\Left 4 Dead 2\left4dead2\addons
2. Play the game!
The mod features no custom sounds (sorry guys, but I am really bad when talking about custom sounds).
There's been an old version of it compiled on the default, crappy animations which can be found here.
Here's the link to the actual model: Mjölnir - Thor's Hammer