Workbench licenses are specific to a particular machine and the license manager tool included with the  Workbenches assumes that the machine has access to the external network. We provide information on our manual about how to download a license when the machine the software is installed on is not connected to the external network:
 

http://resources.qiagenbioinformatics.com/manuals/clcgenomicsworkbench/current/index.php?manual=Download_static_license_on_non_networked_machine.html

This information is written for CLC Genomics Workbench but is also relevant for the other Workbenches.