Setting up DK2 for first time Windows 10

Just wanting to get vrdesktop running for now.

Installed firmware...
Installing Oculus Setup error message: Oculus requires a CPU with SSE 4.2 support

Sounds like your CPU does not meet the requirements. Sorry.
Also, this is not a Development question and should be the Community section.

Well for what it's worth, I've been using the DK2 on Win 7 since it first came out.  Upgraded to Win 10 and it's never worked.  I've upgraded the graphics drivers but now it just complains that I don't have a suitable machine - which is obviously rubbish because it was fine under Win 7.  

Where does one find the old Oculus config utility that doesn't install the unwanted VR environment?

Older runtimes are still available: 
https://developer3.oculus.com/downloads/