@faithless78 will be the right person to ask about this as he’s writing those guieds for South version.
(and jus tthe note - if you want to tag someone you have to leave space inbetween @ and the name out so that it can do magic. 
)
EDIT
In the mean time for Challenge 24 use this post which @faithless78 posted on July 30th. Lesson notes for Challenge 24
Hope it helps.
Hwyl!
Another EDIT
It just came to my mind that Challenge 25 was not released yet so you might wait for a while.