Ok, há outra configuração que precisa ser desativada. Excerto desta link (isso explica algumas outras coisas também).
I took me until a few days ago to realize it was not Windows Update after all but actually an app (game) that I installed recently from Windows Store was updating itself. So I tried these steps:
Open Windows Store app
Go to Settings (click you profile picture to access the menu)
Switch off the "Update apps automatically"
It solved my problem for now but this is just a workaround and you will have to update Windows Store apps manually from here on.
Você pode querer desinstalar aplicativos que talvez não seja necessário, pois eles exigirão atualizações, mas você nunca poderá usá-los.