Hi Blutarsky,
apparently the upgrade is being rolled out step by step so in theory at some point you will receive a further message from Microsoft telling you the upgrade is ready. Can you take a look in your installed updates and see in the upgrade has failed at any point?
My update page just changed to what is shown below. I have seen no large downloads and do not have the $Windows folder on my system. No other notifications regarding the upgrade...
Could they possibly be changing the upgrade process?