how to get the updater NIS 2012 (updated November/ last update). because home internet connection is down. and now has 30 days NIS has not been updated so now NIS inactive
You can't really update the program offline. The only updater Symantec offers is for the virus definition: http://www.symantec.com/business/security_response/definitions/download/detail.jsp?gid=savce
Make sure you download the correct file for your product and your PC (64 bit or 32 bit).
To avoid the hastle, just connect to the web and run LiveUpdate. Did you know, that some mobile phones offer teathering to your PC (provide Internet via phone). Check if your phone offer that capabiliity.