I googled it a bit;
"If you own the PC version of Mass Effect and downloaded the game via Valve's Steam service you might have encountered some problems installing the new Pinnacle Station paid DLC content that BioWare released earlier this week"... bla bla bla. And then it says;
"That post was made on Tuesday night so its possible that the new version that works should be available to download from the EA Store now."
EA store? Say what?







