The tool will fetch the real download link from Steam’s CDN. A .zip or .bin file will appear in the same folder.
generally prohibit downloading Steam Workshop content (mods, maps, items) outside of the Steam client while owning the associated game. Most third-party "Steam Workshop downloaders" (like steamworkshop.download) operate in a legal gray area and can lead to account restrictions if misused.
That said, here is a on the topic for educational purposes: