So on my 64bit Win8.1 box with 12.1RU6 I have:
[HKEY_LOCAL_MACHINE\SOFTWARE\Symantec\Symantec Endpoint Protection\LiveUpdate]
This contains the GUP info (same place as before).
and...
[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Symantec\Symantec Endpoint Protection\SMC\SYLINK\SyLink]
This contains the user/group type info