Supplier website is http://www.cricksoft.com/uk/
Widley used in Primary education in the UK. Crick are releasing version 5 very soon.
Application has a network server mode install (done manually). This then creates a "workstation setup.exe". This can then be installed on workstations using /silent in the command line, which is easy enough.
I'll add details for version 5 as they become clear.
I found the WorkstationSetup silent install to be completely unreliable as it chains the install of two Microsoft components, MSTTS22L and SPCHAPI (to be found under _InsData\MSSPEECH). These two components can be installed silently, but this does not happen by default. Additionally, the WorkstationSetup will sometimes prompt for a reboot.
I got around the component installs by creating two AutoIt script 'stub loaders' and giving them the same names as the MSTTS22L and SPCHAPI components. The original components were renamed. The scripts simply ran the original component installers with the appropriate command line for silent installation. The scripts also watched for any 'overwrite file' dialog boxes and automated the OK click.
Finally, I wrote a third script as a stub loader for WorkstationSetup.exe. This simply chained WorkstationSetup.exe with the necessary command line parameters for a silent install, whilst watching for reboot dialogs and automating the OK click.