I find it more convenient to have the installer (and therefore to be able to easily uninstall the program as well) for most users. But there is nothing that prevents you from zipping the c:\program files (x86)\ww2t folder (in case that is your installation directory) and transferring it to any other computer/location. Just call WW2T.exe then and it should work. When the installer runs it asks you to name the installation directory. If you name it for example WW2T_0.2 you can also have multiple versions in parallel on your computer.
If you could give me one more reason why a zip is preferable… 🙂