When I download plutonium it reaches to 19% until this message pops up as a notification:
"An I/O error occurred for torrent 'pluto_t6_full_game;.
Reason: pluto_t6_full_game file_write (C:\Games\pluto_t6_full_game
Screenshot the qbittorrent window. Also enlarge the status tab so the whole error is visible.
Your C disk probably doesn't have enough space left.