Windows 10 Update Disabler is created by the author "PainteR". Winaero is allowed to distribute it with permissions granted by the author of the app.
Windows 10 Update Disabler was a small tool which prevents Windows 10 from downloading updates completely. It was a reliable solution to stop Windows 10 updates coming to your PC.
Update: The tool no longer works in recent Windows versions. The original author has discontinued it and is not going to update the app. More details here.
It is no longer available on Winaero.