I will provide you a copy of The Auto Schedule Tool. This tool is designed to run against Microsoft Project 2010 or Microsoft Project 2013. It will automatically set the default Task Mode to Auto Schedule. It will also set the Task Mode for all tasks to Auto Schedule.
I am a Microsoft certified MS Project user (MCTS). I have been working with Microsoft Project since the '95 version. I have trained thousands of individuals to work with MS Project.
You can verify my credentials with Microsoft Certification site. Use: