Could be the case...why reverse it when you want it? Anyway, this could help, however it is for people who never saw it in the first place.
http://www.cnet.com/uk/how-to/how-to-get-the-windows-10-upgrade-icon-if-its-missing/
You sort of opted out.
Btw it will be easier for you to go on microsoft's dedicated win 10 page and find the answer under FAQ.