PersonalBrain App Portable

The free app at www.thebrain.com already has a .zip format installer. I don't know how to make that into a portable app, but I would really appreciate it if someone could do so.
Pros:
It's free (but you can activate the pro version)
It runs on USB drives now via its .zip version
Cons:
It requires a .brain file, and I don't know how one would specify where to store the brain folder on the USB drive.

Please make my year and let me put this app in the PortableApps launcher.
Thanks!