The older Windows versions of TorChat were built with py2exe (since 0.9.9.292 replaced with pyinstaller) and came bundled with a copy of Tor readily configured so that it could be run as a portable application right off a USB flash drive without any installation, configuration or account creation.
Between 2008 and 2010 weren't any updated packages, resulting in the bundled version of Tor becoming obsolete and unable to connect to the Tor network,[REF] which was the reason for the appearance of forks that basically just replaced the bundled Tor.exe with a current one.