Installing a different edition of Windows 8 on an OEM system
Copy the contents of the DVD onto a folder and then go to /sources and create a file called ei.cfg, and paste the following info in it.
[EditionID]
[Channel]
OEM
Now make an ISO of the folder and burn it onto a DVD, now during installation, you will get a popup asking you to select the version, select Windows 8 Core and it must work