/s Silent mode. For an InstallScript project, the command Setup.exe /s runs the installation in silent mode, by default based on the responses contained in a response file called Setup.iss in the same directory.
/r Record mode. In order to run an InstallScript project installation program in silent mode, you must first run Setup.exe with the /r option to generate a response file, which stores information about the data entered and options selected by the user at run time. Running an InstallScript installation program with the command Setup.exe /r displays all the run-time dialogs, and stores the data in a file called Setup.iss, created inside the system’s Windows folder. response file name and location, use the /f1 option, described below.
/f1 Specify alternative response file name and path Using the /f1 option enables you to specify where the response file is (or where it should be created) and what its name is, as in Setup.exe /s /f1"C:\Temp\Setup.iss". Specify an absolute path; using a relative path gives unpredictable results. The /f1 option is available both when creating a response file (with the /r option) and when using a response file (with the /s option)
/f2 Specify alternative log file name and path When running an InstallScript installation in silent mode (using the /s option), the log file Setup.log is by default created in the same directory and with the same name (except for the extension) as the response file. The /f2 option enables you to specify an alternative log file location and file name, as in Setup.exe /s /f2"C:\Setup.log". Specify an absolute path; using a relative path gives unpredictable results.

Example

Start the installer silently

setup.exe /s