The Inno Setup install parameters that are required for silent installation.

You can manually search for silent installation keys (e.g. /s, /q, /quiet) or use Silent Install Builder 6, which automatically detects parameters, generates a script, and saves you time. /how-to-find-silent-install-arguments

/SILENT Runs the installer in silent mode (The progress window is displayed)
/VERYSILENTVery silent mode. No windows are displayed.
/SUPPRESSMSGBOXESSuppress message boxes. Only has an effect when combined with ‘/SILENT’ and ‘/VERYSILENT’.
/NOCANCELDisables cancelling the installation process.
/NORESTARTPrevents installer from restarting the system even if it’s necessary.
/DIR=”x:\dirname”Overrides the default install directory.

Example

Silently install the program, prevent restarting the system.

setup.exe /VERYSILENT /SUPPRESSMSGBOXES /NORESTART

If the application does not have silent installation keys, read the guide with proven methods [How to Install Software Silently, Even If It Doesn’t Support Silent Mode].