The FlexNet license manager is automatically installed when installing COMSOL unless otherwise specified on the Products page of the COMSOL Installer; see Products Page. In some cases, it is also automatically configured to run as a service. The check box for the license manager components can be found last in the list of software components, as seen in the picture below:

Alternatively, the license manager can be installed using an automated installation process with minimal user interaction; see Automated Installation. Set
licmanager = 1 in the answer file to install the license manager. Also, it is possible to automatically configure the license manager to run as a service on Windows.