Windows 10 Forced Updates and updating from Windows 7/8 to Windows 10 are two entirely different issues.
To stop Forced Updates within Windows 10 see my previous post.
To prevent Windows 7/8 from trying to convince you to update to Windows 10 you need to uninstall the previously installed update KB3035583. This is done through Control Panel - Uninstall a Program - View installed updates - scroll down until you see (KB3035583) - Right click on it and select Uninstall.
This will remove the update in Windows 7/8 that prompts you to install Windows 10.