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Open Sideloadly. It should automatically detect your iPhone or iPad.
Connect your device to your computer, navigate to the "Apps" section of the manager, and select "Install IPA."
A critical hurdle is the YouTube API, which acts as the messenger between the app and YouTube's servers. Google regularly updates these APIs for security and functionality. When an older app version tries to connect, it often triggers an error because the API it's trying to use has been turned off, leading to the dreaded "Error Loading Tap to Retry" message. This is the primary reason you can't just install any old YouTube IPA and expect it to work.
Change the following fields to a newer, yet compatible, version (e.g., 14.10 or higher, sometimes 15.xx works): CFBundleShortVersionString CFBundleVersion Youtube.ipa For Ios 9.3.5
Tools such as Sideloadly or AltServer (with AltDeploy/Sideloading extensions).
Veteran iOS community forums (such as the r/LegacyiOS Reddit community wiki). Step 2: Set Up Sideloadly on Your PC/Mac Download and install from its official website.
Free Apple IDs only sign apps for 7 days. After one week, the YouTube app will crash on launch. You have to re-connect to your computer and re-sideload it. This is annoying, but free. Open Sideloadly
There are several reasons why you might want to download YouTube IPA for iOS 9.3.5:
If the technical hurdles of jailbreaking or the expiration limits of sideloading are too frustrating, there is a legitimate, zero-fuss solution: the web browser.
If sideloading and editing .ipa files proves too complex, or if server-side API changes eventually break the app permanently, you can use these effective alternatives: Google regularly updates these APIs for security and
For most users on iOS 9.3.5, the safest and most reliable choice is to use YouTube’s mobile site via Safari or create a home-screen shortcut. Sideloading an old YouTube.ipa is technically possible but involves significant security, compatibility, and maintenance downsides.
Reboot your device or force-close the YouTube app, then reopen it. The error should disappear, allowing videos to load. Alternative Solutions for iOS 9.3.5
Change the string values of both keys from the old version number (e.g., 13.42.6 ) to a modern, supported version number (such as 17.33.2 or higher).
Once you have an IPA file, here's how to install it on your device, with or without a jailbreak.
If you use the method above (sideloading with a free Apple ID), the app will stop working after 7 days. Apple revokes the "signing" certificate for free accounts weekly. You will have to repeat the process every week, which can be a hassle.