In codeplex, i can't download the game, Windows XP says "Invalid or Corrupt .zip file". So now what? I've downloaded it 5 TIMES!!!!
I was able to download and unzip fine

For me nothing worked I got the game form Google code.
Use 7-Zip or WinRAR to unzip it.
I have both, they did not work if the zip was from codeplex, I have the game.
EDIT: do not quote posts in front of you!