This app can be used to Update Latest vesrion of YouTube
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your Youtube is not working as it really works - you should install the latest version of this app and use the latest .apk file of Youtube.
In the newest version you should be able to play songs in background and save videos for offline playing.
YouTube Updating can fix problems and errors regarding working of Youtube app. This is only the shortcut to Google Play site with official app.
Update for YouTube.