i would ask and see but i have the 1197si and it didnt have down imagine and i had to do is get a sd card and down load the new version for the unit and i was able to get the down imagine. so i bet that you can register the unit and download the new version to get down image like i did. the 800 series and the new 1197 units are just all ready updated with both side imagine and down scan so im pretty sure you can do it with the 788.