You may receive a message "An update error occurred" in Symantec Endpoint Security when LiveUpdate fails to download the virus definitions.
Symantec Endpoint Security
We recommend that you check your Internet connection and try running LiveUpdate. If the problem still persists, uninstall and reinstall Symantec.
If you do not want to uninstall Symantec, collect the Symantec debug logs and then contact Symantec Support.
RemoveSymantecMacFiles removes all the folders that are created by Symantec/Norton installers and any files within those folders including any you that have created.
See Creating and installing a Symantec Agent installation package