Maybe they downloaded the zip and then immediately tried to open it in a specific program through the open dialog giving them an error. I see similar mistakes with my parents - they have no concept of where files are, it’s just “on the computer” because they rely so heavily on “smart” file picker dialogs that show you everything recent or by a file type no matter where it’s actually located.

A dht crawler is inherently an intensive service to run, magnetico used sqlite and would take 10 minutes just to load the splash page that includes the total count of discovered torrents.