Thinkproject DESITE BIM applications use a Flexera licensing system (from version 2.6.0 onwards).
This guide describes how to setup an on-premise license server (or LLS, for local license server) in case that using the more comfortable cloud licensing system is prohibited by your company's policies and/or technical restrictions: Setup Guide for a DESITE BIM on-premise license server (stratoserver.net)
As you finish the setup process, you can monitor your license usage with the license server: License usage monitoring with a DESITE BIM on-premise license server (stratoserver.net)
And also a document for our corresponding license server: FlexNet Publisher License Administration Guide (stratoserver.net)
If you need help regarding ports for the license server, please refer to these documents:
on-premise Server: thinkproject_license_server_ports
cloud Server: thinkproject_license_comm_details