On your iOS 9.3.5 device, open the App Store and go to the Purchased tab.
I can provide more tailored instructions for getting apps onto your device. ipa+library+ios+935+free
Since the standard App Store often blocks these downloads, you will need tools to manually "sideload" the IPA files from your computer to your device. ios-ipa-collection directory listing - Internet Archive On your iOS 9
But finding a library is the hard part.