So, the good news is I think I figured out what the documentation meant - use the Trac update instructions for linux, substituting /opt/bitnami/ for "installdir". The even better news is that it seemed to work - when going to our trac project now, I'm now told its "powered by Trac 1.0.9". The bad news is that when I go to the bitnami console, it still lists 1.0.4 as the (only) version of trac we're using. Also, the OSX based application manager has stopped working, presumably because its tied to 1.0.4. I can't find any documentation on how to get an application manager app for the updated 1.0.9 version. Any suggestions?