Thanks for the replies, guys.
Hmmm.... I did see them in the installer. The problem was that first time around, I only selected AD2 and the AdPaks before hitting the "Get Deal" button, so I went back into "Register" after AD2 install was finished. That time, I selected the MIDIPaks and hit "Get Deal" again. I mean, what the hell is that button doing there the second time around if I shouldn't click on it, right?
Anyway, I got an error, so I tried again.
That time (third try by now) I selected MIDIPaks and Kit Pieces, but clicked "Back to Installer" or whatever it's called instead of clicking "Get Deal." I ain't no dummy; can't fool me twice!
Back in the installer, I had a list of the Kit Pieces ready to install, but still no MIDIPaks. I installed the Kit Pieces and went back to "Register" for a fourth try.
And a fifth try.
I can select them, but they just aren't showing up for installation. (sigh)