You have successfully upgraded your Enforce and Endpoint servers using the Upgrade Wizard via the Enforce interface console and would like to upgrade your Endpoint Agents.
Data Loss Prevention 15.7
The Upgrade Wizard used to upgrade the Data Loss Prevention (DLP) servers does not provide a facility to remotely deploy the upgrade package to Endpoint Agents.
There are only three options to upgrade Symantec DLP Endpoint Agent
1) Upgrade using the Symantec Management Console
2) Upgrade through unattended upgrade
3) Upgrade manually
For details on each option please read your Upgrade Guide.
Information on where to find the Symantec DLP V11 Upgrade Guide
Note: Follow the upgrade guide for the above link i.e. Symantec™ Data Loss Prevention Upgrade Guide for Windows/Linux as per your environment, Version 15.7