I've visited the official website and used all the download links, but there is nothing close to version 5.5. Therefore, it's impossible to say if it will work on Windows 8.1 or not, but you can try through compatibility. If you are on Windows 8.1, right click the setup package and then go to Properties > Compatibility. Select Windows 7 from the list and tick the Run as Administrator option and relaunch the installer.
Alternatively, you can use the latest version from the official website, because version 8 supports all the Windows releases (at least the modern ones).