Off Topic How to download from youtube when most sites and tools give error?

[mariodxt]

Hi all,
I found a channel that has some content that will be banned in matter of no time so i want to download and share here hopefully but i cnt find the way to download the videos, most of sites i tried give error as if it has copyright or something like that, can you recommend any site or tool for this? I tried allavasoft which usually downloads fine but its not working either, please help! Thanks for any clue about this!!