Upgrading Windows 8 Enterprise to 8.1

Upgrading to Windows 8.1 for Enterprise version users are not as simple as other versions. You cannot upgrade from the Windows Store and it will not be available as a old time "Windows Update" option.

It is intendent that this is a task for the IT Department, that will do this using tools like "System Center Configuration Manager" or "MDT". If you have access to the Windows 8.1 Enterprise ISO file you can do this directly from the CD of course. But beware that you need an Windows 8.1 Enterprise key or update on your KMS

KMS Client Setup Keys to use during deployment

If you are using KMS server or stuff like creating templates without using you licens key you can use KMS setup keys. This keys cannot be activated but works for deployment scenarios where you have to type in a key under installation. For instance Windows Server 2012 and 2012 R2 ask for a key if deploy With MDT, then you can use the keys.