There is also a download link for the older Google Nik plug ins on DXO's website. Robin Whalley has the link on his website and some excellent free Nik tutorials text and video. Like this one:On another forum someone posted this link to some free plug-ins. I suppose Photoshop plug-ins.
Google Nik Collection 1.2.11
Download 7 powerful photo editing plug-ins designed for amateur and professional photographers for free. Analog Efex Pro, Color Efex Pro, Silver Efex Pro, Viveza, HDR Efex Pro, Sharpener Pro, and Dfine.
https://www.techspot.com/downloads/6809-google-nik-collection.html
I haven't downloaded it, but some people here may be interested.
3 Nik Silver Efex Pro Techniques for Dramatic B&W Photos - Lenscraft
Learn three powerful techniques you can use when editing your photos in Nik Silver Efex Pro. One of these is essential to use with every image.
Or his excellent video using the soft contrast slider iso contrast slider and using the dynamic brightness slider.
The Two Most Powerful Sliders in Nik Silver Efex Pro: Bitesize Nik Tutorials on youtube