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This specific version was a significant historical update that added major features like .
: If you specifically need 1.0.4.1 for a certain mod, you would generally need to use the Steam Console ( ` ) to download a specific "depot" manifest, though this is an advanced process not recommended for general play. Quick Setup Guide download-left-4-dead-v1-0-4-1
: Once purchased, the game will appear in your "Library." Click Install to begin the download. This specific version was a significant historical update