[co9ol]

I use to use Vuze but honestly I like qbittorrent way better. Less bloat simpler to deal with. Give it a try!

As for #2 if you've got Catalina you're doing better than me, I'm stuck with High Sierra. As for what to do I'd have to play around with it. There is an option of downloading Monterey, sticking on a USB drive, booting into recovery and then installing it from there. That would only work assuming your Mac is compatible and it might also wipe your files.