I'm using SmartTube on my TvBox and live in fear it will stop working xD
There's also a component for foobar2000 (yes, I'm GenX) called Youtube Source. You can search content, add results to foobar playlists and see the video (embedded in the skin or on a different window). Sometimes the video doesn't load but restarting foobar it's usually enough.
I have the same problem. I also tried installing the languages in troubleshoot mode but I got the same message.
It seems like it doesn't even try to connect, the message appears instantly when I click on install.
No problem with Firefox.