Crash on launch

I have a jailbroken iphone 5s and running on ios 8.4 i recently bought IF legally on app store and when i tried to open it, it crashed immediately after the opening logo, it didn’t even went to the main menu, it’s just crashed soon after. I already done some reboots, deleting multi-task bar, deleting several apps just to get more spaces, deleting the app and installed it again, but nothing happened. I’m really frustrated and confused on what should i do to fix it. Is it because of my jailbroken iphone? Please give me a solution… Thanks

Jailbroken devices are not supported. iOS 8 is also rather old.