I'm new to GOG and bought IR on Steam. My first mistake was not knowing about GOG, my second for assuming that IR would expand on EU Rome. I really enjoyed EU Rome but it had persistent bugs that caused frustrating CTDs. I also didn't realize that IR would be a DLC launcher with the base game almost empty. The game now appears to be a flop and it is unlikely that Paradox will spam DLC like some of their newer titles.