How do I manually download updates

Using Norton Ghost 14 on Windows XP Pro SP3

 

My home PC connects to the Internet via Dial-Up-Networking (DUN) at approx 24Kbps - Using liveupdate on this computer to download a 35MB update is IMPOSSIBLE for me!!!

 

I download large updates at work using a high-speed Internet connection, but Symantec/Norton does not seem to have a way to manually download updates.

 

I will NOT attempt to obtain them from a third-party source.

 

Thank you.