Double click the Network_Probe_2.x-install.exe file and follow the instructions.
During the installation, a packet driver will be installed as well. A restart of the computer is required after installation is done, otherwise the packet driver won't start. The 2.x version will not overwrite any existing 1.x versions. If you have a 1.x version installed, you can copy the file "Program Files/Network Probe/config/config.txt" to "Program Files/Network Probe 2/config/config.txt", to keep old configurations. Any logged data from the 2.x version can also be copied from "Program Files/Network Probe/statistics" to "Program Files/Network Probe 2/statistics".
The first time Network Probe is started, you are prompted to set a password for the "admin" user.