How do I install this campaign?
Before you install, please make sure you have the 'Steam Client' installed along with 'Left 4 Dead 2' and its 'Left 4 Dead 2 Add-on Support' (available under the 'Tools' tab in Steam). Also make sure the game has been launched at least once through Steam. Then, all you need to do is to extract and/or move the ihatemountains2.vpk here:
...Steamsteamappscommonleft 4 dead 2left4dead2addons

To successfully see our custom visual effects:
Everything should work straight out of the box.

To successfully hear our custom sound effects:
Everything should work straight out of the box, except a few missing sounds maybe.

To successfully see our hints:
Because it can be quite intimidating to survive the first tries, enable the game instructor in Options > Multiplayer > Game Instructor and then, type gameinstructor_reset_counts in the game console to reactivate all the help messages. To learn how to activate the game console, follow the following link:
Ihatemountains.com

How do I uninstall this campaign?
Simply delete the ihatemountains2.vpk located here:
...Steamsteamappscommonleft 4 dead 2left4dead2addons