the file you download must contain the complete game, at the end it should show you a screen that says
"Here ends chapter 2! At the moment this is all the content developed for this project, thank you very much for playing!"
If this is what you saw, it is all the content of the game so far, but since you have bought it you will have access to all future updates without having to pay again :)
If that's not what you saw, let me know so I can update the download file!
