DayZ

[Nipper]

Steam does actually suck.

Funnily enough I am yet to find DRM that doesn't.

Your best bet is DL Arma 2 Combined Operations from Steam.

Let it download, then play Arma 2 (just the original), get to main menu, then exit, run operation arrowhead, do the same, then (this part shouldn't be necessary but I did it just to make sure), run Combined Operations, main menu, exit.

Then, install @DayZ into your operation arrowhead folder.

Make sure you are running a beta too, not sure of this as I do things a bit differently.

Oh, and to save yourself some space on your HDD, just create a junction between steam/steamapps/common/arma 2/addons and steam..../arma 2 operation arrowhead/addons

That way, you won't need to copy GB's of data over. (Some people don't have this issue, some do.)