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打開...\left 4 dead 2\left4dead2\steam.inf  ，全選並貼上以下文字：

// NetworkVersion is the version in the wire protcol between client<->server,
// its not used for matchmaking, PatchVersion is used for that to ensure
// we don't get cross connecting to different releases.  Only bump this if
// you know an incompatible change has happened to the network protocol in
// game and old demos will not work.
NetworkVersion=2.0.4.2
PatchVersion=2.0.9.2
ProductName=left4dead2
appID=550