This document provides instructions for installing and setting up licenses for PTV Visum 2020. It discusses installing the Codemeter dongle used to manage licenses. Licenses can be single-seat or network licenses. Single-seat licenses allow one user on one computer to use the software, while network licenses allow multiple simultaneous users over a network. The document provides step-by-step guidance on installing Visum, selecting licenses, and troubleshooting potential issues.