The Symantec Protection Engine installation program checks for previous versions of the product. The results of the check determine what happens next:
After you install Symantec Protection Engine, activate all applicable licenses. If you upgrade from a previous version that has valid licenses, when the installation is complete, Symantec Protection Engine automatically recognizes these licenses.
See About licensing
Symantec Protection Engine is shipped with the minimum set of URL definitions. If you want to use URL filtering feature, ensure that you run LiveUpdate and get the latest URL definitions before you start URL filtering.
See About filtering URLs.
If Symantec Protection Engine fails to start before it can initiate standard logging, information about the failure is written to the abort log file (SymantecProtectionEngineAbortLog.txt). This file is located in the installation directory.
If you need to install or upgrade multiple Symantec Protection Engines on your network, you can use the silent installation or upgrade feature to facilitate the process.