Hi JJanK68,
I'm sorry you are having trouble finding the exercise files.
They all flow in numerical order.
You are referring to exercise 2.
The next one will be exercise 3, then 4 and so on.
You can ignore the chapter numbers, as that is how the content is grouped.
I can assure you that many more learners would be confused if the exercises where not labelled in numerical order. (the first exercise would be called "2.6")
It might be of interest to you Jan that there is an updated version of this course here which also allows you to upload your files so I can check your understanding.
The current course only allows video submissions (which was all that was available at the time).
I haven't seen you upload any of your work so far, so I am unable to check your learning progress. Doing this will benefit your learning.