I have installed MultiGet to my machine and I don't know how to use it. I tried to download videos from YouTube by pasting URL to MultiGet but it didn't work. So what should I do now?
MultiGet likely does not support downloading YouTube streams (tested with version 1.2.0). If you specifically want to download videos from YouTube, there are several other ways such as
See this question for other YouTube downloading solutions: How do I download a YouTube video?