Symantec Endpoint Protection LiveUpdate fails

I had an unmanaged SEP install that failed to update itself - even after I uninstalled and resintalled.

Turned out the answer was to update from LiveUpdate 3.3 to LiveUpdate 3.5 via this link:

ftp://ftp.symantec.com/public/english_us_canada/liveupdate/3.5/lusetup.exe