1-2 weeks ago, I had installed Windows 8 RTM N Enterprise (X64) with licence. But for some reasons, I want to install Win8 (MSDN) Enterprise (X64). I want to point out that there is no "N". Now it looks like it is hard to activate Win8 with KMS. Is it possible if I backup my existing licence, which is for Windows 8 RTM "N" x64, and use it for Win8 (MSDN) Enterprise (X64) I'm pretty sure it is possible to backup and install in new installation. But I'm not sure if it will work since they are different versions.