On Windows, download the .cmd file and double-click it to create the topology.
On Linux or macOS, download the .sh file and execute it via the command:
$ bash vn-topologyNUM.sh
where NUM is the number of the topology, e.g. 01. IP addresses all start with 192.168. For example, the IP address of node 1 in topology 1 is 192.168.1.11. See virtnet for further details.