如何将从移动设备开发的旧（iPad 2）应用程序提取回源文件

I built a game back in 2012 that was in the apple store for about a year and never renewed my dev subscription so it was taken down. I found, what is likely, the only existing iPad that has the game still installed. I was hoping to extract the files and begin working on the game again in Unity. Any and all help is appreciated.I built a game back in 2012 that was in the app