Been some time since I touched this. Grabber still works just fine for me, but after youtube-dl ended up slow, I started using the fork youtube-dlp which led to some parsing issues in the output, so you couldn't open files and it would mention the webm instead of a song on conversion.
To use youtube-dlp with Grabber, just rename the executable to youtube-dl.exe (so, without the p there). That's it, put it where you'd put the normal youtube-dl.exe, either with Grabber or in your path.
That's all the changes really, since Grabber has been stable for a long time now, I think it deserves to be put at a nice version 1.0 for the sake of it.