IF so, it could be why you're receiving the notification. Removing the update should "get rid of it".

You can read more about it here:
http://microsoft-news.com/microsoft-is-now-asking-windows-7-and-windows-8-users-to-reserve-their-free-windows-10-upgrade/

If you have your updates set to install automatically, make sure to read the below in order to prevent it from installing again:
http://microsoft-news.com/how-to-remove-windows-10-upgrade-notification-on-windows-7-and-windows-8/

There are 4 other updates tied to Windows 10, but I believe KB3035583 is the update responsible for the notification you're seeing.

Best of luck,
Carol