Installing Win 8.1 Code only New Build

[xcmbyte]

I know someone with a code (but not a DVD) for win 8.1 he could give me, but I want to install it on a pc I'm going to build in a few days and am unsure how to do so.

 

[Someone Somewhere]

http://windows.microsoft.com/en-us/windows-8/upgrade-product-key-only

Note that you'll need a genuine, retail key.