I Dont Know

I have an iPod 4th Gen Which runs ios 6. Here is a game that supposedly runs on IOS 4.3. So why does it not work on IOS6!!! I set up my profile, go into practice, it crashes. I try again, start playing one winged angel on expert, set up my party from the 3DS version, start the song, it loads, then crashes. I loved this game on 3DS, and I sold it for some reason (Probably needed money for something, it was a year or two ago) and I download this to re live the game. But I am unable to as it cant run on 6 when it claims it works on 4.

SWF34 about THEATRHYTHM FINAL FANTASY