I've been working to deploy Spacegass for our organisation and thought I'd put in my 2cents here on what I did.
I used the SpaceGass.exe installer and ran the following switches via a batch file:
"SpaceGass[version].exe" /S /v /qn
As long as I have .NET 3.5 enabled on the later versions of windows this seems to be working as a silent install.
I have also exported our license file from the Titan Client, and am using the below command in the batch file to import our license server settings:
"TitanClientTool.exe" -t "[NetworkShare]\TitanClientConfig.dat"
The -t switch means that the license information is imported for all users. Using -s will only import the license info for the currently logged in user.
Hope this helps
Setup Type: Windows Installer (Delivered as an EXE)
Deployment Method Used: Vendor Provided Command Line (switch driven)