iso image - Downloading a Windows 8.1 .iso from MSDN with an OEM key

I have a computer with Windows 8.1 preinstalled. I'd like to obtain an .iso so as to be able to reinstall it in case something happens.

I know about the solution which uses the upgrade method but it's not very handy. Windows 7 in VirtualBox has some features turned off and besides, I'd have to give it half of my whole RAM. I'd like to have the real iso, for the setup recognize to recognize the key embedded in UEFI.

I'd like to download directly from MSDN but I can't find a way to activate a subscription from an OEM key.

Is there any way I could get the .iso directly from the MS servers without tinkering with virtual machines?

Answer

You can download it from here: http://go.microsoft.com/fwlink/p/?LinkId=510815

_{Note that this is the actual download link (downloads when you click on it), rather than a resource page containing a download link.}