Select to target network computers by IP range or Active Directory containers.

If you are looking for the "paper" on this upgrade, you are likely looking for the or the Migration Guide . However, here is an analysis of the most interesting technical aspects of that specific transition.

If you want, I can:

Download the Symantec Endpoint Protection 14.3 installation package from the Broadcom Support Portal.

What you are using (Embedded or Microsoft SQL Server)? How many endpoint clients live in your environment?

Verify that services such as Symantec Endpoint Protection Manager and Symantec Embedded Database are in a "Running" state under Windows Services.