Use this method for targeted deployments or remote installations. In the SEPM console, click > Install Packages . Click Upgrade Client Packages .
The leap to 14.3 is less about "new buttons" and more about "new intelligence":
Always upgrade your management servers before updating individual client endpoints. Step 1: Run the Installer
This guide provides a comprehensive, step-by-step walkthrough to safely upgrade your Symantec Endpoint Protection Manager (SEPM) and client endpoints. Prerequisites and System Requirements symantec endpoint protection upgrade 14.2 to 14.3
Save the current recovery file ( .xml ) to an external, secure location.
The installer will automatically detect your version 14.2 installation and prepare the migration path.
Verify that the "Home" page shows the server and clients are now running version 14.3. Use this method for targeted deployments or remote
Upgrading SEP from 14.2 to 14.3 is a relatively straightforward process. Follow these steps:
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Provide administrative credentials for the target machines to execute the remote installation. 5. Troubleshooting Common Upgrade Issues The leap to 14
SEP 14.3 brings support for newer operating systems, including Windows Server 2025, and adds Microsoft Edge support for Browser Intrusion Prevention.
14.3 introduces significant database schema changes. Depending on your log size, the upgrade process can take longer than usual.
If 14.2 clients lose connection to the 14.3 manager, ensure TLS 1.2 or TLS 1.3 protocols are enabled on your server, as version 14.3 deprecates older, insecure cryptographic protocols.