Howdy! I had to figure out silent installation today & couldn't find a solution to this online, so just leaving my own findings :)
The server install option is a 'component', not a 'task', so you'll have to define which components should be selected in the silent install parameters. The Inno Setup command line documentation was super helpful to reference. To get the exact parameters for the Components command, I ran through the setup with <a rel="nofollow" target="_blank">/SAVEINF=</a>"filename" , which will spit out a configuration file with all of your desired options.
The command I used for silent install is as follows:
<blockquote class="Quote">.\setupRepetierHost_2_3_1.exe /COMPONENTS="Components=app,slicer,slicer\curaengine,slicer\slic3r,slicer\slic3rpe,assoc,assoc\stl,assoc\ast,assoc\3mf,assoc\obj,assoc\amf,assoc\gcode,assoc\gco,assoc\g" /MERGETASKS="desktopicon" /VERYSILENT /SUPPRESSMSGBOXES /CLOSEAPPLICATIONS
This command installs Repetier-Host without the server, sets all file associations, and adds a shortcut to the desktop. My only remaining issue that