Hi Rover,
I did backdate to W10 but it didn't resolve anything, (no 4K), it still does some updates though anyway, I'm now certain that Windows is the culprit as to why PS CS6 is crippled, the latest is that now the PS application to start the program is put on the desktop it will no longer fire up and comes up with a panel that says "can not find DLL" yet when you click on the desktop icon within the program file it fires up but won't open DNG files .... but all works on my old W7 laptop fine, the updates are set to "never" which shows it' the updates are the cause.
I tried DXO trial of 30 days, but it is very slow to open and changing the settings, but takes too long to live with.
So I have downloaded Nikon's NX studio which is also slowish but it's free ... I also have Darktable , yet to try it out.
Super frustrating all round!