At the root of the DVD you will find the file starrynightcollege6.msi
Please note that silent installation requires that prerequisites for Starry Night College are also setup on the system. You will need to install these prerequisites silently as well but separately from the main installation.
The prerequisite files live in the folder "prerequisites" at the root of the DVD drive.
You can silently install all prerequisites and the main msi using the following switches for each prerequisite:
Visual C++ 2010 Redist: switch is /passive (eg. vcredist_x86.exe /passive )
Apple application support (installed before QuickTime): switch is /qb (eg. msiexec /I AppleApplicationSupport.msi /qb )
QuickTime: switch is /passive (eg. QuickTimeInstaller.exe /passive )
AdobeReader: switches are /sPB /rs /l /msi"/qb /norestart ALLUSERS=1 EULA_ACCEPT=YES SUPPRESS_APP_LAUNCH=YES" (eg. AdobeRdr940_en_US.exe /sPB /rs /l /msi"/qb /norestart ALLUSERS=1 EULA_ACCEPT=YES SUPPRESS_APP_LAUNCH=YES" )
Main msi: simply use /qb (eg. msiexec /I starrynightcollege6.msi /qb)
If the prerequisite has an exe file then the switches are passed to the exe file directly on the command line. If the prerequisite is an MSI then the switch is passed to the installer via msiexec. Please note the examples in paranthesis above. Those may be exactly the commands you need or they may have to be adjusted for slightly different names of msi or exe files.
Let me know if you need any further assistance.