I'm not running through Steam, and I'm having a similar issue. For me, I click the icon, and it goes through the check for update, the the nice 15th Anniversary graphic comes up for a bit, and it dumps back out like it never happened. No log that I can find. I was running Open Beta, and have tried repairing, and even reinstalling to a new SSD from the Official DCS download link. The only anti-virus I have going is the vanilla Windows Defender.