Hi everyone.
I also clicked on Andrew's link and found that it only provided a 15% discount. I wasn't too crazy about that, so I checked my gmail and found, as others reported above, that the e-mail from Nik was in the spam folder. I marked it "Not Spam" to move it to my inbox.
The e-mail indeed invited me to download a free copy of the Nik Collection by Google. There were two download boxes in the e-mail. The box on the right was labeled "Windows Download", while the one on the left was not labeled. Being a Mac guy, I clicked on the unlabeled box and hoped for the best. And voila, I downloaded the Nik Mac package.
I dragged the 257MB package from my download file to my desktop, double clicked the install icon, and installation went smoothly into all of my Photoshop and Lightroom applications.
So thanks to everyone for alerting me to this excellent free software!
Norm