: Tools like Sideloadly or the older Cydia Impactor allow you to "sign" the IPA with your own Apple ID.

This is the most stable method for legacy devices and avoids frequent revokes.

: Drag the downloaded YouTube IPA into the tool’s interface. Enter Apple ID : Provide your credentials to sign the app.

: On your iOS device, go to Settings > General > Device Management (or Profiles), find your Apple ID, and tap Trust . Method B: No-Computer Method (Safari & E-Sign)

: Plug your iPhone 5 or iPad into your PC/Mac.

: A reliable source for legacy app preservation is the Internet Archive , which hosts various versions of official YouTube IPAs.