: If you experience crashes, verify your game files by right-clicking Left 4 Dead in Steam > Properties > Installed Files > Verify integrity of game files .
: Visit the official Left 4 Dead Steam page. If you do not have Steam, download the client from steampowered.com . download-left-4-dead-v1-0-4-1
: To install custom maps (a feature introduced in 1.0.4.1), place .vpk files into your \left4dead\addons folder. : If you experience crashes, verify your game
: A minimum of 1 GB RAM and a Shader Model 3.0 compatible video card are recommended for smooth gameplay. : If you experience crashes