Upgrading installed apps

Hi there
I would like to know how can I upgrade an app for example qbittorrent via atomic toolkit?

I have installed qbittorent on my raspberry pi 2 running raspbian with qbittorent v3.1.10 (is this the latest? for ARM?)
I have tried following this guide but no go - http://www.htpcbeginner.com/qbittorrent-...nd-upgrade

Much appreciated.

Regards