Their is a problem – Miragine War Review

I used to play this game a lot on the computer and when I saw this I got it. But it says it is compatible with iPhone 5s and iOS 8.0 or later, but it says the update is incompatible with this device which is an iPhone 5, and I have a iOS later than 8.0. So I was wondering what caused this to happen
Review by Ninjagojosh on Miragine War.