Uh, my PhotoLab version is 3.1.0 build 4301. No updates available to me. Don’t see any newer release notes for Win or Mac. Am I missing something? 
The Nik versions: each app has its own version number, different from the bundle version. That’s pretty standard in my experience. I have Nik Collection 2018 version 1.1. From my logs:
Analog Efex Pro 2 (Standalone) Version 5.0.1.61 Revision 61, 64 bit mode, built on Oct 30 2018
Color Efex Pro 4 (Standalone) Version 5.0.1.61 Revision 61, 64 bit mode, built on Oct 30 2018
HDR Efex Pro 2 (Standalone) Version 5.0.1.61 Revision 61, 64 bit mode, built on Oct 30 2018
etc.