When I say you need the full version, I mean that while you can replace the v2.01 anrb.exe with the 3.11 beta anrb.exe, it would be better to have some of the other updated files to provide updated country flags and Mode-S code ranges etc. That is the only reason why it would be better to do it that way.
There is no reason that you will need any of the beta versions when the final 3.xx release makes it out the door.
Part of the problem is that some people are not understanding what must be done to make the program operate correctly, especially the effect of installing on Vista or Windows 7 and the attempt to run the standalone .exe file instead of saving it over the old exe file.