How to install:
1. Unzip the treeview_zoocategory.zip file, you will get one file, treeview.php, and one folder called treeview.
2. FTP upload the extracted (treeview.php and treeview folder) to this path: modules/mod_zoocategory/tmpl
3. Fine the ZOO Category Module and click it to edit.
4. Select Treeview from the Theme select list.