Foe Win and Android delete the original ( default ) ux folder and copy pongo ux folder.
For win you have to rename files ( extension ) :
grid_menu_layout.zip- => grid_menu_layout.zip
the_skin_grid_menu_layout.zip- => the_skin_grid_menu_layout.zip
Just delete character "-" from extension.
Now is : .zip-.
To be used by nextGen must be : .zip.