Default custom rom add ons

hi guys i have got a great custom rom from carotix his carHD rom for the s4 is lovely, but i'm trying to put some add ons into the rom that i have downloaded from the forum, but when i put these folders into the installation folder and zip it back up my recovery no longer sees the file to load it, does anyone know where i'm going wrong...is there a specific folder i'm supposed to put these add on folders into?