Trace files issue

i’m noob :wink:
i’m reading wireshark Network Analysis 2 ed.
it seems a good book, but when i downloaded the 1.5 Gb of trace files from wiresharkbook site, as support for book examples of Wireshark packets analysis, and when i unpaked them, only few packets .pcapng i found in the zip file…how it’s possible?

The book claims that there would be hundreds of trace files!! in fact many trace file appointed on the book lacks in the dowloaded files…
can anyone help me about?
thanks in advance!!