If you still want to try installing the original legacy files for testing or collection purposes, several reputable archives host them:

Keep in mind that using an older version might mean missing out on newer features, bug fixes, and security patches.

While most modern apps no longer support Android 2.3.6 (Gingerbread), you can still find ways to watch videos on these vintage devices. Official support for the YouTube app on this version ended years ago, but dedicated communities have developed workarounds to keep these phones functional. Finding a Compatible YouTube APK

on the Android device (e.g., “File Manager” or “My Files”).

Settings → Applications → Check “Unknown Sources”

Later versions force you to create a unique @handle. Version 23.6 still allows commenting using your channel name without the extra step.