Shame the pages were lost..
I have the directories as you describe (I managed to peice that together from reading various posts), but my plugins.ini was slightly different. Changing
win32 ..\realbot\dll\realbot_mm.dll RealBot
to
win32 ../realbot/dll/realbot_mm.dll RealBot
makes these two warning messages disappear:
WARNING: RealBot is NOT installed into the correct directory!
WARNING: rbnbx files will not be created nor personality files!
However the 'realbot add t 2' command still only adds one bot, and only as a spectator.