In the Real Drums section, there's a button to press to allow it to "rebuild" the database, but there's not a "rebuild" button in the Real Instrumements box.

I downloaded Real Instruments Rock/Pop Pack #1 and installed it in the same directory as the real instruments I have in the directory from before, but I can't get RB to "see" the new downloaded instruments.

I'm using RB 2008.5 v4