How do I install Windows 8.1 on my Dell Latitude 10?

I downloaded Windows 8.1 from MSDN. When I tried to run the setup from Windows, it said the OEM key is not supported with Windows 8.1. I surely can use a retail key from the MSDN account but that is my office account, and I should be able to use the key that I paid for anyways. Is there any work around? For example, on the desktop PC, when I edited the ISO file to bypass setup from asking...