The application is available for installation on 64bit systems. I have downloaded the package from the official website and installed it without any other extra configuration or settings. Simply download the package and save it to your desktop, then right click it and choose Run as Administrator. Follow the installation guide and that's it. Next time you run the software, make sure you do it with Run as Administrator option when you right click the shortcut.
Download page: http://wisi.se/index.php?id=186