do you have a desktop link to start the game ? if so: -> right button -> Settings -> there you should find the installation directory .... but if you have problem with that I guess that you have never installed the alteriw.net ...cause than you would have known ...so you should do that first ! the tool will not work without! -> look in the forum to find a tutorial how to install the alterIW.net and where to get it! ... if you have the legit copy of the game than you will find the game dir. in the steam - folders! but this is only visable if you have the checks on in explorer ->"show hidden files/folders..systemfiles ....aso" if you dont get it now I am sry for you.