Because these apps are modified, they cannot be installed through the official App Store. Instead, you must "sideload" them. Below are the three most reliable methods for iOS 12. Method 1: AltStore (Computer Required)

Before downloading and installing a patched YouTube IPA, ensure you have the following ready:

Free, no jailbreak. Cons: 3-app limit (unless you pay for a developer account), 7-day expiration.