Before launching the app, you must authorize the developer certificate: Open on your iOS device.
Search for "iOS 9.3.5 IPA Archive" or "Classic iOS Apps." Many archiving enthusiasts upload full sets of verified, clean IPAs.
If you really want to use an old iOS device as a YouTube player, jailbreaking iOS 9.3.5 is the most practical route.
Sometimes the App Store offers to download the last compatible version, but on iOS 9.3.5, this often results in a broken, non-functional app that shows only a black screen or errors.
Sideloadly is a modern, frequently updated tool for Windows and macOS that works perfectly for installing apps onto legacy devices. Download and install on your computer.
Wait for the status bar to show "Done." The YouTube icon will appear on your iOS 9.3.5 home screen. Step 5: Trust the Certificate on iOS
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The most stable route is obtaining the last version of YouTube that the App Store allowed to run on iOS 9. While this version lacks all modern features (like comments sections in certain views or live chat), it still provides basic playback functionality. However, simply installing this is not enough; you must also modify it to "spoof" (fake) a higher version number to the YouTube servers so they don't reject the connection.
Make sure you installed AppSync Unified from Cydia. Conclusion
An .IPA file is the standard archive format used to package iOS applications. Under normal circumstances, you click "Get" in the App Store, and Apple installs this file automatically. On iOS 9.3.5, two major roadblocks prevent this:
A prompt will appear: "Do you want to download the last compatible version?" Tap .