Hi,
You can opt any of the following option.
• AutoUpgrade--assign client packages to groups in the Manager console, either manually or by using the Upgrade Groups Wizard.
• Permit product updates in LiveUpdate Settings policy for a client group in the Manager console.
• Local installation from product disc.
• Run the Client Deployment Wizard from the Manager console. It will walk you through the creation of a client package that can be deployed via a weblink and email, remote push, or saved for later local installation or deployment using third-party tools.
Autoupgrade is one of the easiest way to upgrade clients.
http://www.symantec.com/docs/TECH96789
I hope it will help you !!