Thanks for the responses. So by just installing the hard drive version, and then the latest update, of BIAB, I'll be gettnig the latest version of RB as well, yes?

I have the 2014 UltraPlusPak (with compressed RealTracks). Any idea how many GB these RealTracks take up? While on the one hand it might save me space to use the supplied external hard drive, I also use another external hard drive for the sample libraries used by Kontakt, which is my preferred sound source. I can imagine it might be cumbersome / tricky to have to carry around two external drives and make them work together smoothly, computers being computers.