I created an exception for the game in my anti-virus software just in case. Was I supposed to do something else after installing that earlier program? The files in the StreamingAssets folder are mp4 files.
Nope, if you've updated your operating system, including any optional updates included, you should be fine. And if you've added the MotH folder to your AVs exclusion list, that will help as well if it's preventing you from loading the game.
If you're on Win10, I'd recommend running the game as administrator as well.
The guide here will help you with any other issues you might run into.
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And if you have any other questions, concerns or problems, please don't hesitate to ask and I'll help you in any way I can.