This is not a bug per se as much as you are using the wrong command. Coming from 2.3.7 to 2.4.6 is a massive leap as version 2.4.0 brought on the use of systemd rather than init. We've assumed that everyone had made the leap by now and have not posted these details anymore
Try the following (as root):
Then follow that up with a
Once you have rebooted your machine you may want to run your updater once more and check to see if the version matches our current v2.4.6
Additional to note (and this is very important)
In version 2.4.0 we have opted to use a cleaner directory tree for easier recognition of RTorrent vs. Deluge torrents. See the following post for the full set of details.