I downloaded the 30-day free trial of Silver Efex Pro 2, which I’m told will install and run in Windows 10 as a plugin or as a standalone application. However, upon attempting to install it in the latest version of Windows 10, I got the message telling me that my “operating system is beneath the system requirements” and that the system requirements only allow up to Windows 7 as the latest operating system. This is the system requirements from 2012, when Silver Efex Pro 2 was first introduced. I have owned the original boxed version since then and have it on my 2012 model Windows 7 laptop. That the system requirements haven’t changed since then tells me that it is not compatible with Windows 10, yet DXO claims otherwise.
Could you, please, provide us with your logs - c:\Users%user_name%\AppData\Local\DxO\Nik Collection Installer Logs\ ?
P.S. Please, report about the issues in the corresponding section, “Silver Efex Pro” in your case as this one should be used only for the suggestions of the new features.