The ITRAC Python Toolkit (I-pt) utilizes Tkinter for its GUI, which in turn utilizes TCL 8.5. If a different implementation of TCL is installed on a user's machine, it may override the TCL version that Tkinter needs and cause problems.
If you encounter errors while launching I-pt that are related to TCL versions, go to your computer's environment variables (right-click on This PC, select Properties, select Advanced System Properties, select Environment Variables) and delete or rename the TCL_LIBRARY variable. This will cause Tkinter to look for a local TCL library and utilize it instead of using the overridden library.