My game's version is 1.3.2. How can I update to the latest version. Will it delete my saves if I do?
You received an email when you bought Game Dev Tycoon via FastSpring. In that email, you have multiple download links. Just redownload the game and reinstall it. That is all you need to do.
Alternatively, you could activate your game via Steam and enjoy the automatic updating there. You should have received an email with your Steam Key a while ago.