Edit: All the links to the latest version of Norton Internet Security (NIS), Norton AntiVirus (NAV), and Norton 360 Standard (N360s) and Norton 360 Premier (N360P) are forward compatible so that the links would download the latest version whenever you visit and I no need to update the links every year.
You may not realize it but starting from 2006, Symantec has allowed all users with a valid subscription of their Norton software to make a FREE upgrade to the latest version (Version 2012 as of the publishing of this post. Just go to http://www.norton.com/nuc to check if you qualify!
Alternatively, you can download the direct installer from these URLS. Be sure to download the latest version to the product you already have! For example, Norton Internet Security users cannot upgrade to Norton AntiVirus and vice versa. Also for Norton 360 make sure you check if you have standard or premier (25 GB of online storage) and download the file accordingly!
- Norton Internet Security http://www.norton.com/latestnis
- Norton AntiVirus http://www.norton.com/latestnav
- Norton 360 Standard: http://www.norton.com/latestn360
- Norton 360 Premier: http://www.norton.com/latestn360p
- Download the required files to upgrade
- Download Norton removal tool from http://www.norton.com/nrt
- Back up identity safe if you are using it (Norton AntiVirus doesn't have identity safe so they need not to worry).
- Disconnect your internet by turning off the router or turning off the wifi switch or removing the cable.
- Uninstall the Symantec product through the conventional way (Through add/remove)
- Restart
- Run the Norton removal tool you downloaded earlier.
- Restart
- Go to %programdata% and delete the "Norton" and "NortonInstaller." DON'T delete any other files other than those two.
- Install the product from the installation file you downloaded in step 1.
- Restore identity safe
