With Webstart you are always using the latest version. Once you have started RouteConverter via Webstart, no connection to the Internet is required to run RouteConverter since Webstart offers to put an icon onto the desktop or add an entry to the start menu. Thus Webstart is a real alternative to downloads without any drawbacks.
To start the program with Webstart, click on the Launch button above. If everything is installed and configured correctly, a Java Web Start window should appear shortly followed by the question if you'd really want to start RouteConverter.
If you click on Execute RouteConverter is started.