NIS 2012 update problem

Sir,

 

I have got a 3 user NIS 2012.  I have installed one of these on a PC  in my office and one at my home.  My home PC does  not have internet but I have got that NIS activated by once using mobile internet on that PC.

 

After that I used to download the NIS 2012 update file from my office pc to update the security files on home PC.  Yesterday I again used the mobile interenet on it and whle surfing, I checked the update of NIS 2012 and it showed me 110 MB of update pending for Norton spyware files whereas yesterday only I had updated NIS with the latest updates.  As i am not able to download it via my mobile, i tried my office PC and surfed your site.  But I was not able to find the updates for it.

 

Pls tell me from where can i get these updates.  I am using Windows 7 on my home pc.

 

Regards