You do not want the Play Store to “fix” your app by upgrading you to an incompatible version.
For users determined to keep their Android 5 devices, the coming years will involve a series of workarounds. The easiest path is to rely on a modern web browser, which acts independently of Google's restrictive app policies. youtube android 5 version full
The open-source community has patched the last working Android 5 version to remove ads and enable background play for free. Look for (requires patching the v17.49.37 APK yourself). This is the true “full” experience because it bypasses Google’s server checks. You do not want the Play Store to
that "spoof" the app version to make YouTube servers think a newer OS is being used. Historical Significance of Android 5 The open-source community has patched the last working
Whether you use an older sideloaded APK or the browser method, simply sign in with your standard Google Account.
Since the standard app is no longer officially supported, users rely on legacy versions or third-party workarounds: