Love the game but it won't download – Nerdy Workout Review

I've played this game on my friend's iPad and really enjoyed it so I went home and "downloaded" it. I did and by the app it said open but it didn't work so I went to the home screen and it wasn't on there. I've tried downloading it about 15 times now and it still won't work and I keep having to go to usage settings and deleting an app that isn't even there.
Review by Dancer216 on Nerdy Workout.