What’s going on here?

Everybody suggests me this app that it is a good app considering it’s free but now it seems no longer free at all, even worse, it does not play my mkv files correctly. When I open the mkv files, the app just doesn’t get to start. Now I see that the last update was about 4 years ago. It should be kept updating not to be fallen behind to demands!

baizzang12 about MPlayerX