I am also recently having problems with YouTube downloads. It all started last Friday or Saturday. Same errors and issues as shared above, with analysis failing. Occasionally, I manage to download one or two videos successfully, but that’s the exception, not the norm.
For grins, and to test, I went back and installed v6257 — same problems. So now I’m re-installing v7007 and will wait and see what additional info is shared here. Looks like YouTube has become unavailable for a while.