We've heard from a few people recently that ms2a keeps blowing up when they try to play it, so we've released a hotfix that should fix it. We're sorry for the inconvenience, and hope you'll enjoy milestone two.
If you run into issues, as always, please reach out to us on the Discord or forums. We've also put up an older version on a branch, which you can try in event of emergency. Or if you just like 2016 better.