This one is a bit more challenging and can be tedious for those who have not used Wireshark.
Download the pcap file. Open Wireshark from the C:\APPS\CTF\NETWORKING folder on your computer. Open the Pcap file in Wireshark.
We need to Analize and Follow TCP Streams.
Look through each TCP Stream until you see something that looks like a flag. When you find it, you might notice it is not in plain English.
Perhaps entering this entire line into a web search might give you a hint on what to do next.