Silent installation of Kiwi Syslog server without the web portal. Is it possible?

We used the command "Kiwi_Syslog_Server_9.8.1.setup.exe" /S INSTALL=SERVICE" to do a silent install of the Kiwi Syslog Server but it also installed the webportal as well.  What am I missing if I wanted to do a silent install of Kiwi Syslog Server without the web portal? 

Is there any documentation that lists out all the command line installation options?

Thanks in advance.