If you have downloaded the wip #4 (i.e. the realbot_mm), you don't need the realbot.dll anymore.
For example I put my realbot_mm.dll in my RealBot\dll folder.
After that put this line in your plugins.ini (metamod)
win32 ../RealBot/dll/realbot_mm.dll Realbot

Launch a game and check if the realbot_mm.dll is loaded by:
meta list

-- EDIT --
I didn't see that meta say it is well loaded.
Which command do you use to add a bot?
rb_addbot? or realbot add ?
Only the second one works...