NO I can't see them in these libraries
in the general MacOS Library, nor in the User Library
to install them I used the pkgs in the hards drive BIAB sent me about a months ago
the folders list is as follows
Applications
Band-in-a-Box Setup.pkg
Band-in-a-Box UltraPAK
License.rtf
PDF Manuals
Plugins
ReadMe First.rtf

the Plugins folder as follows
Plugins
Audio & MIDI Plugins Installer.pkg
Data
AmpliTube
Install AmpliTube 3.10.mpkg
Installation and Authorization Manual.pdf
Uninstall AmpliTube.app
Sforzando
Install HiQ_Instruments.pkg
Install_Sforzando_v1.916.pkg
ReadMe.rtf
I used Install HiQ_Instruments.pkg
and Install_Sforzando_v1.916.pkg
which I now find in
/Applications/Band-in-a-Box/Plugin Settings