Since uYouPlus is not available on the official App Store, you must "sideload" the IPA file onto your device. There are several popular methods for doing this: 1. AltStore (Recommended)
Download videos directly within the app (up to 4K resolution) for offline viewing. uyouplus github
The main reason users flock to the uYouPlus GitHub page is the sheer number of improvements it offers over the stock app: Since uYouPlus is not available on the official