I've already bought the programm twice. I bought the normal livetime version three years ago from the website. Today, a few months later I tried to start the programm again and nothing happend. So I deinstalled and tried do download it again. But I can't download it because i allegedly haven't bought it...
If FileBot does not launch after you have successfully installed FileBot and clicked on the FileBot icon, then more details are needed. Does it crash on startup with some error message? Does it run but open a window outside of the screen bounds where you cannot see it? The console output would likely provide such details.