Especially as a longtime Left 4 Dead 2 player, it’s important to keep that in mind.
Those things mentioned above came with your current installation of Left 4 Dead 2 on your Steam account, thus making your copy of Left 4 Dead 2 heavily modified. You do have to be mindful of the worst offenders below when it comes to reinstalling/fixing your game which will be addressed later: Believe it or not, you can get a fresher “copy” of the Left 4 Dead 2 without deleting and reinstalling everything. The number one thing to do when a game is given a major update is to make sure your copy of the game is as clean as possible especially when it comes to its default settings.
