Deploy the Reflection for the Web Launcher Installer (RWebLauncher.msi) file using the system of your choice, such as Microsoft Group Policies.
For reference, the Reflection for the Web Launcher Installer, packaged as RWebLauncher.msi, can be accessed from the MSS server: MSS\server\web\webapps\rwebclient\ex\RWebLauncher.msi.
NOTE: If you are using a web proxy, use the provided PowerShell script to generate a transform (*.mst) file that customizes RWebLauncher.msi with your preferred networking settings. Then, deploy the transform file (RWebLauncherEx.mst) along with the Reflection for the Web Launcher (RWebLauncher.msi), and install them together on the client machines. See When using a web proxy.