Older YouTube versions rely on older versions of Google Play Services. If the app crashes immediately, you may need to find an older version of "Google Play Services" APK as well, though this is a more advanced process.
If you are still using a device running Android 5.1 (Lollipop) in 2026, you know the struggle. Your phone might be a legendary device (like the Galaxy S4 or Nexus 5), but finding apps that still work is becoming a nightmare. youtube apk android 511