Note: If you have never downloaded YouTube on your account, sign into your Apple ID on a newer iOS device first and "GET" the app there. It will then appear in the "Purchased" list on your older device.
On iOS 12.5.7, the current YouTube app is officially unsupported as it requires iOS 16.0 or later. However, you can still access YouTube using one of the following methods. Method 1: The "Purchased" Section Workaround (No Jailbreak) install youtube ios 1257 exclusive
In version 12.57, the dislike button still showed the actual numerical count. YouTube removed this feature server-side shortly after version 13.00, but because 12.57 uses an older API, some users report the dislike count remains visible for longer. Note: If you have never downloaded YouTube on