It doesnt work on IOS 4.3.5

I installed this app, but after uploading it is not working anymore and the vocabularies which I saved before, can not showed, because they arent in the program anymore. They have been lost. So what should I do. I was sharing the opinion that this program is the best Flash Card App, but I can not study with this program anymore again.. PS: Because of my Gevey iPhone I can not upgrade my IOS! Any idea?

deu_safa about Flashcard Elite: proven memory algorithm for flashcards, v1.2.3