This is often related to a signing issue. Since you are using a free Apple ID to sign the app with AltStore, the certificate is only valid for 7 days. You can address this in two ways:
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: Tap the Cloud icon . A popup will appear asking if you want to download an "older version of this application". Tap Download . Method 2: Sideloading YouTube IPA Files Youtube Ipa For Ios 7.1 2 Download
This method will install YouTube version , the final version that officially supports iOS 7.1.2.
Sites like the Internet Archive host specific older versions, such as YouTube 2.7.1 or versions from the 10.x series, which are often the last supported builds for iOS 7. This is often related to a signing issue
AltStore is the most popular and user-friendly tool for installing .ipa files on non-jailbroken devices. Here's how to use it:
The modern YouTube application requires advanced API frameworks built into iOS 14 and newer. If you try to open the standard App Store on an iOS 7.1.2 device, you will encounter error messages like "Incompatible with this iPhone" or "Unable to Purchase." : Tap the Cloud icon
If all else fails, use Safari. You can navigate to m.youtube.com and use the "Add to Home Screen" feature to create a shortcut that acts like a web-app.
This message typically appears if you try to open a modded app you downloaded directly from a website without going through a signing tool like AltStore. The iOS security model requires all apps to be signed by a certificate. The fix is simple: delete the app and reinstall it properly using the AltStore method.