Transmission portable app made with Lightdesk. Fast, easy, and free BitTorrent client.
1
Download and install the latest portable setup where you want then run transmission-portable.exe.
If you have already installed Transmission from the original setup, move the following files :

%APPDATA%\transmission\* to data

Then run transmission-portable.exe and remove Transmission from your computer.
Upgrade
For an upgrade, simply download and install the latest portable setup.   
Modifications
Here is what differs from the original release to ensure portability:

Transmission home path is forced to data folder path.

Configuration
Transmission portable can be configured through the main YAML configuration file :

app:
cleanup: true

cleanup : Cleanup leftover folders (default false)