When running silent installation of FineReader PDF 16 using Setup.exe /qn, setup dialog boxes (select interface language, etc.) appear. Therefore, the installation is not silent.
Information about the command /qn for silent installation in the System Administrator's Guide corresponds to the previous FineReader PDF 15 version.
The information about the commands for silent installation will be soon updated in the System Administrator's Guide.
For silent installation of FineReader PDF 16, please use /s or q/.