Can't install update 'Upgrade to Windows 10 Enterprise, version 1511, 10586' (KB3012973)

I can see that I have a new update on my machine 'Upgrade to Windows 10 Enterprise, version 1511, 10586'. The Windows update is constantly nagging me to restart my computer but when I do restart (I select 'Update and restart' nothing happens, the machine just restarts normally. When I go to the knowledge base link for the update (https://support.microsoft.com/en-us/kb/3012973) I get 404.

I've tried ruing:

• sfc /scaow
• DISM.exe /Online /Cleanup-image /Restorehealth
• MediaCreationTool.exe

SFC and DISM reported no errors and everything looks to be ok. On MediaCreationTool.exe I selected the Upgrade but it claims that my windows version is not supported by that tool. Winver states that I'm on Windows 10 Enterprise (Build 10240).

Does anyone have any idea how I could apply the update?