If you are running Windows 8 Pro or some versions below, you can start “STORE” and upgrade to version 8.1 trough here. But in Windows 8.1 Enterprise, you do not have this feature.
Instead: Download the source files for Windows 8.1 that fits your Windows 8 version. Run this command from the media “setup.exe /auto:upgrade”
This way it is possible to use Configuration Manager to control this upgrade by creating a package with these source files and an installation sequence that has the above commands inside.
You can read this blog for more telling information regarding this feature.
Have a nice day 🙂