When I try to join a multiplayer game the game says I have an invalid cd key.
 Can some one help?
  
 
  
  
    Did you type it in correctly?
 Did you buy a legal copy of the game? 
 Did you get the game used?
 
 LucasArts may be able to help you with your CD key problem (unless you just pirated the game), I suggest you contact them about it.
  
 
  
  
    See if the game came in a large box with Republic Commando stamped all over it and make sure you didn't have to install any crack to use the game.
 
 If you did, then it's a pirated copy and you won't be able to play the game until you get a legal, original one.
  
 
  
  
    Yeah. And if you bought it from a guy in a dark alley, who had the game in the pocket of his long trenchcoat, you might also be a bit suspicious.... ;)
  
 
  
  
    I have this SAME problem, and i bought mine from wal-mart, and they dont sell this ****
  
 
  
  
    I have this SAME problem, and i bought mine from wal-mart, and they dont sell this ****
 
 
 How can you know that?
 
 Okay, forget I posted it.
  
 
  
  
    I have the same problem. i have The BoPC version. I've played multiplayer before;but, I uninstalled it and put it on a different drive and can no longer play.
  
 
  
  
    Me too! I have the same problem. I have The Best Of PC version. I installed it and i can play single player, but not multiplayer. If anyone got an answer, send it to [Redacted]@[Redacted].[Redacted]! Thankx