@platypus & all
… and after installing Nik 3.3 ‘over’ the version 4
(see Issues with Nik4 - #8 by Wolfgang)
it’s getting even more interesting
SEP3 from Nik4 (addition of Nik3.3)
the very same – Viv3 from Nik4 (addition of Nik3.3)
… and of course one gets an upgrade information 
see → post #5