If you have an iPhone 6s or newer, you cannot downgrade iOS. Apple stopped signing older iOS versions years ago. This is not a viable path.
This specific old version of iTunes still has the App Store built-in. You can "buy" the app there, which then allows your older device to see it in its "Purchased" history and offer the legacy download. IPA Archives: Sites like Archive.org sometimes host legacy files. To install these, you generally need a tool like Sideloadly youtube ios 125 7 download apk old version top
: Open Safari or Chrome and navigate to m.youtube.com. If you have an iPhone 6s or newer, you cannot downgrade iOS
: Even if you install an older version, Google frequently forces an "Update Required" block that prevents the app from loading. Apple Discussions Verified Ways to Watch YouTube on iOS 12.5.7 This specific old version of iTunes still has
Before downloading files from shady third-party sites, you should try the official method, which Apple introduced specifically for this scenario.
Even if you successfully install version 12.5.7, YouTube (Google) occasionally cuts off server access for very old versions. If you open the app and see a "Tap to Update"
If your iPhone is currently running YouTube version 125.7 and you never updated it, you can :