The net seems to point toward Audacity only.
I presume the error you are
encountering when you try to install Audacity is that it searches the plug in folder when
booting and eventually reaches one it doesn't like and crashes the boot?
don't know if it is a work around, but maybe setting up a new profile on the Mac would
stop it from searching your plug in folder on booting and you can extract the MOGG file
there? Just a thought. Otherwise take all the plug ins out of the library to boot
Audacity, but this will potentially cause some trouble (maybe, I'm only guessing).