How do i get the dlc on the pc version

If you're only choosing one, Broken Steel, obviously. It extends the entire game.

I'm pretty sure you have to buy them, like expansions for any PC game. But in my experience, it's easier to buy a copy of the game of the year version, it'll work out cheaper. You can get it off Amazon for ￡10, as opposed to Broken Steel costing ￡10 on it's own.

thanks ill get the game of the year version then