|Question 8.7 addresses capturing packets in promiscuos mode which:|
In computing, promiscuous mode or promisc mode is a configuration of a network card that makes the card pass all traffic it receives to the central processing unit rather than just packets addressed to it.
your contradiction is therefore incorrect.
2.8.1. Install Wireshark
You may acquire a binary installer of Wireshark named something like: wireshark-setup-x.y.z.exe. The Wireshark installer includes WinPcap, so you don't need to download and install two separate packages.
So you see WinPcap IS FREE.