Exectuables that are distributed with program for beta testing, but not distribution, freely available for academics at:

DSSP (Generates residue properties like solvent access for structure)

MSMS (Used to generate molecular surfaces in structure viewer)

HBPLUS (Used to calculate hydrogen bonds)

Download the files and unpack if necessary.

Move the executable files to the Application directory of your Envision install

Rename the executables to msms.exe, dssp.exe, hbplus.exe (sorry for the *.exe linux people)

Voila, I hope.

Executables that appear free for distribution and are packed with the Envision Package

MUSTANG