How to fix a app on your iPhone?

I got this app and it is called Big Time Rush: #1 BTR Fan App. I'm having a very hard time with its new update because they have videos on this app and I can't seem to watch them anymore. I tried to delete the app but Every time I do then it will tell me that I have to update It again. The problem with this is that I can't play the videos. I used to play them very fine but ever sense this update I can't seem to play them. I email the owner of the app. I emailed like 5 times and they did not even response to me. What Should I do to fix this problem

It might be a bug in the developers app so if they don't respond there isn't much you can do.

Just Uninstall And Reinstall It!