Your output_log.txt looks more or less exactly like mine. You even seem to have the same driver version.
Both "NullReferenceException: Object reference not set to an instance of an object" and "The referenced script on this Behaviour (Game Object 'Flowchart') is missing!" are issues that only the dev can fix. Are you on Windows 7 or Windows 10? If you're on Windows 7, it's important that you keep it 100% updated, and have the
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installed (not the same patch I linked to earlier) If you're on Windows 10, and everything is updated, I'm out of ideas. Sorry :\