i received Darksiders free with my computer. i downloaded it at the steam website, the install was clean. but when i click to play it, a window pops up and says "first time setup; 1 of 2". it quickly disappears and says "the game is currently unavailable, try again later".
i contracted steam. in the list of issues, in the drop down menu, one of the options was this very query (game says currently unavailable." i have since contacted them another time, each time getting only the automated do not reply email.
Have you got the Steam client installed on your system, and do you have a Steam at all? If not, when you visited the Steam website originally did the related info suggest that Steam client would be installed automatically?