I am running NUC5i7RYH...
I cant speak for Intel whether it is officially supported at present, but I upgraded to W10, as part of Windows 10 Insider Program, and had no problem with any of the drivers, other than I had to downloaded and install most drivers manually. The Intel driver update app didn't recognise W10, at the time (early June), but that may have changed as of today's W10 release date..
I have not yet upgraded my NUCs to 10, but saw another thread (NUC5CPYH Windows 10 64bit Video Driver) with a similar question and the answer from Intel was:
"The drivers available for Windows 10* can be found here:
note: the graphics driver needs to be downloaded through windows update."
That is of course for a different NUC generation, but I assume it's similar for Haswell NUCs as well. Intel's download center has LAN, Wifi, USB, etc. drivers for Windows 10 now. Intel® Download Center
Just one thing to look out for, check the date of the drivers.
The bundle appears to be outdated by the individual drivers.
I got caught out presuming the driver bundle had the latest drivers - it doesn't. It's just the latest bundle. The bundle is dated at 1st July;
Most of the individual drivers are newer than those in the bundle, a couple are the same. Several of the individual drivers are dated 17th July.
I guess in next week or so, they'll update the bundle with the later drivers.
Hope this helps.
I looked, and as far as I can tell, there are currently no Windows drivers posted by Intel for the D54250WYKH. Therefore, I have some questions:
1) Do I NEED drivers specifically for Windows 10?, and
2) If (and when) drivers are available, are they to be loaded before or after I perform the Windows 10 upgrade?
You can find in the following link the drivers available for this product you just need to filter the Operating system option for windows 10*:
You need to install these after loading the operating system.