A pop-up will appear saying, "Download an older version of this app?" Tap .
This is the most reliable method that doesn't risk your device's security. Open and go to m.youtube.com. Tap the Share button (square with an up arrow). Select Add to Home Screen . install youtube ios 1257 best
If you encounter a persistent "Update Required" or "Error Loading" message inside an installed older app, you may need a jailbreak to bypass version checks. A pop-up will appear saying, "Download an older