Copy music from youtube to windows 10

Hello friend,
I would like to copy music from youtube . I had a music converter to register on WMA but after not using it for a moment he didnt work anymore .Could you give me the name of a good one who isn't to difficult to handle. I found one who looked like what I would need but there I been told to stop the ad blocker. First I dont particularily do this and second I dont know how to do it. Could you advise me how to go about it. Please dont forget, I am not the youngest any more and wasn't born with a lap top.
Thanks in advance