You cannot simply take the latest YouTube IPA (built for iOS 15+) and sideload it onto iOS 10.3.4. It will crash instantly. Why?
The magic version you are looking for is YouTube 14.02.03 (or 14.03). This was the final release to support iOS 10.3.4 before Google pulled the plug in late 2018.
Sideloading apps from the internet carries risks. Because you are downloading files from unverified third parties, there is a potential for malware, though it is rare on non-jailbroken devices due to iOS sandboxing. Youtube Ipa For Ios 10.3.4
Sideloading means installing an IPA using your computer, without Apple’s App Store. This is the most common method.
Avoid them. Stick with Safari or jailbreak-based solutions. You cannot simply take the latest YouTube IPA
Use AltStore for sideloading apps without jailbreaking (note: AltStore supports iOS 10.0+):
There are three primary methods to install an IPA file onto an older iOS device. The magic version you are looking for is YouTube 14
Method 1: Sideloading via PC/Mac (Free, Temporary) This method uses Apple's developer tools but is free for the public. The app expires after 7 days, requiring a re-install.
Method 2: On-Device Signing (Requires Jailbreak) If your device is Jailbroken, you can install the IPA directly on the phone without a computer.
Method 3: Permanent Signing Services There are third-party signing services (often advertised as "No Jailbreak, No PC") that re-sign apps using enterprise certificates.
Go to m.youtube.com in Safari. Click Share > Add to Home Screen.