If it was like the first demo they took it and all the servers for it down when the game hit stores.
Steam removed it from my list as well.
It's still in the Steam folder though; i can launch it from there.
Same here but cannot seem to play online.
Yeah likely they disabled that.
I can heartily recommend buying the full game
L4D2 demo was pretty shit actually, made me worry about the full game, which it turned out was better than i expected.
