Show only Child-Categories

Hi,

I have one Categorie in the pluggin and 2 child-categories.
Each file have double category the parent and one child-category.

I just wanna show a table with the subcategories like this
https://dl.dropboxusercontent.com/u/3517/1.PNG
I try to use the code of the Ajax Tree, and try to make it, but i can’t delete the link of the download on each category.

I can do the list of the files in a one categorie, but no the list of the subcategories.

https://dl.dropboxusercontent.com/u/3517/2.PNG

I try using the walk_categorie, but it’s simple, don’t work.

I hope u can help me, thanks!

https://www.ads-software.com/plugins/simple-download-monitor/