I am receiving numerous calls saying Windows 10 just appeared and I had no way of stopping it.
This appears to be with people not reading items on their screen.
In Windows update the following will appear.
This is in the optional updates.
So if you do not want Windows 10 at that time and my strong advice is to wait for about 3 months , DO NOT PUT THE TICK IN IT.
if you leave the tick in , it will run and install.