You can only activate if KMS servers/emulators are available. Also you can't restore activation backup on different editions.
That works if you are using the Windows 8 AIK. The original poster was using instructions for people still on Windows 7 and using the Windows 7 AIK.
Actually I was thinking of the RTM copy of DISM inside everyone's W8 ISO's. But I see the point of being able to do it from 7.
Would this tutorial also work for creating a x86-x64 combo iso? I remember doing something like this for Windows 7 to do that.
As soon as I get my desktop up again, I'll make a batch file to create an all-in-one with proper repair and such like I did for Windows 7. I cannot find Enterprise-N x86, does it exist? Can someone PM me a link? I am trying to be patient for a MAK key though as I hate KMS :\