If you use Network Licence mode, you will have to install a License Server on a selected computer. You may have to adjust network rules (firewall rules, port transfert) depending on your configuration.
You have selected the computer that will be used as the Licence Server
You have downloaded then Sentinel RMS Setup program
Start Sentinel RMS setup program
In most cases, default setup options should be kept unchanged
At the end of the installation procedure, a service named 'Sentinel RMS License Manager' is running.
By default, Sentinel RMS uses port UDP 5093
See Network License Download Page