An unattended installation is an installation that is performed without user interaction during its progress or with no user present at all. To perform an unattended installation in the default 'program files' installation directory, run the following command on the 20-sim installer:

20sim.exe /S

It is possible to set an alternative installation directory by using the /D argument. It must be the last parameter used on the command line and must not contain quotation marks, even if the path contains spaces. Only absolute paths are supported.

20sim.exe /S /D=D:\My Installation Files\20-sim 5.1