Silent installation Parameter for installation of Siemens SINUTRAIN version 4.8

I am an application packager, where we need to install package(applications silently) on a number of users machine though SCCM.
I needed help with silent parameters for installation of Siemens SINUTRAIN, I managed to record RS_Auto.ini using this parameter setup /recordmode=C:\Temp. & I was executing with parameter provided on website which was setup /silentmode=C:\Temp\Ra_Auto.ini, but using this application is not installed silently, it shows UI which should not be the case. Could you please help me with a possible solution to install the application silently?