The most reliable "library" for iOS 9.3.5 is your own Apple ID history. How it works

The Sideloadly Method (PC/Mac): This is the most reliable current method. You download the IPA to your computer and use Sideloadly to "sign" the app with your Apple ID and push it to your device via USB.

: If you have previously "purchased" (even for free) an app on a newer device, you can often download a compatible version on your old device. : Log into the , go to the

Since the App Store frequently blocks "new" downloads on older firmware, you may need alternative installation methods: 1. The "Purchased" Tab Trick (No Jailbreak)

Netflix & YouTube: These often require server-side connections that old app versions can no longer handle. Browsing via Safari is sometimes the only workaround.