I purchased NIK Collection 4 nine days ago and have been trying to install it on my Windows 10 PC ever since.
Ureka!!! Last night I finally got it to install, however, the installation problem had nothing to do with the NIK software it was my operating system!
In short, if you are having similar problems, type the following in you browser and follow the instructions. It’s a microsoft program.
“Fix problems that block programs from being installed or removed”
I did this and all my problems with NIK Collecton 4 installation were solved.
The software installed on my PC, DXO PhotoLab 5, Photshop elements and Lightroom without any problems.
Hope this helps someone.