Thread:DominusMortem/@comment-24111404-20150712025112/@comment-3547390-20150713141337

"GOG one is already patched with NewDark, that is the one and only difference as far as I know."

Yes, it sounds like the Steam one doesn't have that stuff by default. I would still advise going in to your directory and checking to see what executables you have, plus which one is starting by default. From what I see (brief research), Steam would be a better option than GoG.