First of all
After you install EntitiesToDTOs, open Visual Studio. If you had Visual Studio open during installation, close it and open it again.
EntitiesToDTOs won't show the main window if you don't have a Solution open, so open a Solution to start using the tool.
With a Solution open, go to the TOOLS
menu and click on EntitiesToDTOs
, look at the image below for reference.