On your old iPhone/iPad, go to Settings -> Store -> set Apps to Off. Turn off your iPhone or iPad by holding down the Sleep/Wake (Power) button until the Power switch appears and sliding it to the right. Plug the cable into the computer, but not the iPhone or. Go onto your computer (it doesn't matter if it's a PC or a Mac) and open the iTunes app. Then go to the iTunes store and download all the apps you want to be on your iPad/iPhone. If the iTunes on the computer and your iPad are both signed into the same Apple ID, and the iPad is connected to the internet, then go on your iPad/iPhone to App Store -> Purchased -> tap on an individual app you want to install. You'll get a message that says 'The current version requires iOS 6.1 or later, but you can download the last compatible version,' just hit Download. This method should at least allow you to have most apps on your outdated device.

Most of them will work, but sometimes even once you have the app installed on your it still won't run correctly. But in my experience that's not too common apps usually work just fine.

Old Snook for ios instal