That's actually the older version. Version 5 is the first free version. But if you buy (or have bought) the older version, they will provide technical support on version 5. Not worth it in my opinion because you can just go and buy WinRail (which is the exact same program). In fact, the newest version of WinRail had 3-D rendering and some other nice features. I don't know if it's worth the $89 price tag, though, what with 3rd Planit and other better ones for not much more...
-Rory