SMP 7.x: <InstallDirectory>\ProgramData\Symantec\SMP\Logs (ProgramData is hidden by default. In the "View" options, ensure "Show hidden files, folders and drives" is selected"
SMP 8.x: <InstallDirectory>\ProgramData\Symantec\SMP\Logs (ProgramData is hidden by default. In the "View" options, ensure "Show hidden files, folders and drives" is selected"