'Update service installed using windows installer without getting uac prompt

I have a app which gets installed in C:\Program Files{AppName} and a service associated with that app (NT Service{ServiceName}). This app asks for uac prompt during the installation and the service shows Elevated = "Yes" in task manager. Now, I need to update this app silently without getting uac prompt. I tried the below code which didnt work (Update didn't go through and no log file got created).

Process.Start(
      new ProcessStartInfo("msiexec")
      {
          ArgumentList =
          {
           "/i",
           "new_version_file_path",
           "/qn",
           "/L*V",
           "Log_file_path",
           },
           UseShellExecute = true,
      });

I thought that since the service is showing to be running in elevated mode update should go through. If I add my service to the local Administrators group then the installation runs fine and the app gets successfully updated. Why do I need to add it in local administrators group ? Is there another way I could update the app using c# without using any 3rd party application?

c++sharpwindows-installer


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