Bad Hilarious Wolf said
Hey 
I use FetchTV to dowload video but it does not work with YouTube
Any advice on an application that could help to download YouTube good stuff?
  

Search for one of the many Y2Mate sites. No point me giving you my list of sites, as I sometimes have to try several to find one working that day, as they can be a bit hit or miss.
You paste the address of the YT vid, and it processes it for download. Usually gives you options for size, video only (if you don't need the sound) or just audio when ripping music.
I have a stack of addons for firefox, but they seem to stop working with YT constantly updating to limit downloading (and adblocking). So I just stick to the Y2Mate now, saves time and hassle 🙂

Bad Hilarious Wolf said
Thanks Ricks, alas it seems not working. Error message says: RROR [youtube] gtcUb3XN7WM Sign in to confirm your age. This video may be inappropriate for some users. Use --cookies-from-browser or --cookies for t
although I am connceted and can see the video at the same time.
But thanks in any case, seems it is well protected 🙂
[Permission to view this media is denied]
  

If that's the vid you want, I just tried on a couple of sites and it downloaded fine.

Paste your YT link:

http  s://www.youtube.com/watch?v=gtcUb3XN7WM
(had to add spaces to 'https' to avoid it inserting the YT vid here)

into either of these sites boxes at the top, and download:

[Permission to view this media is denied]

[Permission to view this media is denied]

In case those still don't work for you, let me know, and I'll sort out a link for you to download it. I tried attaching the vid here, but it must be wrong format or something 🙂