Offline YouTube feature suddenly gone Till yesterday noon I was using this offline option, but from yesterday night I can't get the offline option. My YouTube app is built-in app, will that make any difference?

I even tried re-installation of the app, but I still didn't get it. Help me to get my offline option back.  

I found that my YouTube was updated on 18th September 2015. But since I used the offline option since yesterday (21st September 2015), I think the version is not the problem.
offline mode is for youtube red users now