@constie,
did you ask DxO support for a download link for the previous version ( Nik 3.3 )?
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being on Windows, I installed the old version ‘over’ the new one
→ Issues with Nik4 - #8 by Wolfgang -
some ‘comparison’ with PL’s side menue
→ About Nik 4 - SilverEfex 3 & Viveza 3 -
unfortunately SEP3 & Viv3 are incompatible with older PS versions
→ Backward Incompatibility Viveza - #2 by Wolfgang