It`s a good idea to create a install.inf response file for a customized install.
WinSCP-5.15.1-Setup.exe /LOADINF="install.inf" /VERYSILENT /NORESTART
"%ProgramFiles%WinSCPunins000.exe" /VERYSILENT /NORESTART
Martin Prikryl公司 WinSCP软件的静默安装卸载方法步骤