If you go to Intel's driver update area for the NUC D54250WYK and select "Windows 8.1, 64-bit" it will list the latest version as:
"Graphics: Intel HD Graphics Driver for Intel NUC" (8/6/2015) 15.40.3.4248
But if I attempt to run the Setup I get the following error:
"This computer does not meet the minimum requirements for installing the software."