为什么看不了生存杯的DEMO啊？

mwh1996

// 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=2.0.9.1
ProductName=left4dead2
appID=550