The most reliable and safest method to get a working YouTube version without third-party files is through your existing Apple ID history. The Process
If your iOS 12.5.6 device is jailbroken (using tools like Chimera or Freya), you can install the app permanently without a computer.
Summary
An is the application package used by iOS devices. It is similar to an .exe file on Windows or an .apk on Android. Normally, these files are downloaded and installed exclusively through the official App Store. However, Apple allows developers (and users) to install IPAs manually through a process called sideloading . Sideloading bypasses the App Store, allowing you to install apps that are no longer available, modified versions of existing apps, or completely third-party applications.
The YouTube IPA is an alternative version of the official YouTube app, which can be installed on iOS devices without jailbreaking them. This IPA version offers additional features and functionality not available in the official app. youtube ipa for ios 12.5.6
Running YouTube on iOS 12.5.6: A Guide to IPAs and Workarounds
If the app installs but shows a "Please Update" screen that prevents you from watching videos: The most reliable and safest method to get
If your device is jailbroken using tools like Chimera or Freya for iOS 12, you can install the app permanently without a computer.