The following command line can be used (%~dp0 used for source directory):
msiexec /i "%~dp0Dragon NaturallySpeaking 11.msi" /qb SERIALNUMBER=<SerialNumber>
Their Admin Deployment Guide for ver. 11.5 can be found here: http://www.nuance.com/ucmprod/groups/dragon/@web-enus/documents/collateral/nc_017974.pdf
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