Start Killer - Silent Install

I am trying to run a powershell script and want to be able to do a slient install for startkiller. When I run startkiller /s, in powersell or command line, I still get a popup wanting me to go through the install. I am using startkiller v6.

Is there another way to get it to do a slient install or am I missing something?

The right command is:

Code:

startkiller /S