How to recover Photos from my Iphone 4s on a Private Photo App?

I downloaded a Private Photo App years ago on my Iphone 4S, now when I go to the app, it just crashes. I want to recover the photos I placed in the app, but don't know how to without going into the app itself?

THEY WERE STILL KEPT IN THAT PRIVATE APP OWNER SERVER AND WAITING TO SELL TO ANYONE WHOM WISH TO DO ANY PUBLICATION OR ILLEGAL ACT. YOU HAVE NO Way TO GET IT BACK BY PLAYING THIS SILLY APP WITHOUT KNOWING THE RISK.