How can I update my Iphone's IOS without updating certain apps?

I have the app "Itube" installed, this app was very popular about a year or 2 ago for saving videos from youtube to your iphone free, the app is used as a music player and browser, however I recently tried to download this app on a newer apple product, and the app had a major update that completely killed the usefulness of this app since now you can only download music from Soundcloud, My iphone 4, which i recently found, still has this app in the old version where you can download anything you want without soundcloud, I want to know if there is a way that I can update my iphone's IOS without updating this app too!