Hi again,
I can't manage to upload the zip file to the Private Files by Drag and Drop but I can by clicking on Add & then browsing to the file on my hard disk.
Having uploaded it, I can't add the whole set of exercises: only the first one appears even though I select "Add all the files in the selected folder".
Locally on my Moodle 2.4.1 it's even worse: if I click on Edit tasks the page appears corrupt. I'll send you a screenshot if it's useful.
Cheers,
Glenys