First step, verify your files... Go to your Steam account >> The Long Dark >> Properties >> Verify Integrity Of Game Cache Which game version are you playing (I'm assuming v.218 or earlier since the build doesn't match the newest Unity 5 test run version). You should also attach your output log so the devs can take a look to see what might be interfering with the game starting up. Info to find your output debug files here: viewtopic.php?f=55&t=504 Verify Integrity Of Game Cache - doesn't work. Always shows 0% completed. Log file doesn't exist in mentioned folder.