PSIcapture discreet deploy / MSI installer / SCCM installer
Our installer uses a bootstrapper to handle the prereqs and then kick off the main .msi installer. This page explains the command line parameters available for the bootstrapper and ones that can be passed to the msi.
A simple discreet installer might look something like this:
PSIcapture.Setup.184.108.40.206.exe /extract "C:\PSIsetup"
Additional commands/parameters may be necessary to account for permissions and other elements of your unique environment. This process should be completed by your internal IT department.