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The mobile website version of YouTube is now very robust and supports the modern "Dark Mode" and interface that the old app lacks.
"Looking for the YouTube app on iOS 12.5.7? The latest compatible version is YouTube 17.39.4 (or newer, if still supported). You can download it directly from the App Store. If you see 'This app requires iOS 13 or later,' tap 'Download Last Compatible Version' when prompted. No jailbreak needed – works on iPhone 5s, 6, iPad mini 2, iPad Air, and iPod touch (6th gen)." youtube app for ios 12.5 7 download
"Download YouTube app for iOS 12.5.7 – compatible version for older iPhones and iPads" The mobile website version of YouTube is now
The most reliable way to download a compatible version is through your Apple ID purchase history. iPad mini 2