Offline Update problems

pls my network is not good enough to update NIS 2012. so, i downloaded the offline cumulative updates about 139.1MB but after running it and a message telling me that "intelligent updater found a norton product and was succesfully updated" and the NIS interface initially showing me the green status, it turns to red and says at risk the solution is to update online which is about 92MB and my network is so bad i barely get 6MB/day. Why doesnt the offline cumulative update work??? Thank you all!!!