On Windows, the installation procedure will install a folder for Stat/Transfer in the Programs menu and a shortcut to Stat/Transfer. A shortcut to Stat/Transfer will also be installed on your desktop. Click on either of the shortcuts to start the program.
On OS-X, click on Stat/Transfer in the StatTransfer15 folder of your Applications folder.
On Linux, a shortcut to Stat/Transfer will be installed on your desktop.