Lately, Steam Libraries seem to be getting lost. Under Settings, check to see where your "downloads" are going. Despite my placing DCS on an SSD by itself, Steam gets confused by other (beta) installs. It's not like Steam is the worst option, as I'm not so secure with a Russian built torrent app which moves files on my system. But since I don't have any national secrets, the GRU can knock themselves out looking at my stuff.