Just finished installing these DLC's on Steam and I cannot find them when I launch the game, I assume they're located in the challenge section, Catwoman is there but neither Robin or Nightwing. Anyone know what's going on with this? I've never had trouble with DLC on steam before.

Thanks.

Maybe there's some hidden rule like play the main game until a certain point?

You have to download them with the GFWL client.

@DarkShaper: So there's no way to use the ones I purchased from Steam?

If you purchased Batman AC on Steam they should work. Did you try validating your game files?

Pretty sure steam just gives you an unlock code that you use in the gfwl marketplace to actually get the dlc, I bought all the dlc for Fable 3 through steam and had to get that directly from gfwl.

@Kidavenger: This was it, got them up and running now.

Thanks.