To get the latest bleeding edge Octopi code all you need to do is run:
git clone https://github.com/aarnt/octopi.git
And after you have Octopi’s repository you can update it just running:
If you use Arch Linux and yaourt you can grab Octopi by the “octopi” (stable) or “octopi-git” (dev) packages, thanks to the great community.
Manjaro Linux also has Octopi in its repository: packages “octopi” and “octopi-notifier”.