There's no need to install any 3rd party software. Microsoft themselves provide the switch to disable upgrades to Windows 10:

https://support.microsoft.com/en-us/kb/3080351

(and you can also simply not install/uninstall KB3035583 aka GWX)

MS isn't respecting the update settings I choose allready. I no longer trust any of the so called "solutions" they are offering.

Edit: in my particular case I tracked it down to a third party install that was forcing a windows update, so it wasn't directly an issue with MS in this case.

With all due respect to this official microsoft solution, it's a huge pain in the complicated ass for casual users to follow. GWX Control panel is just click, click, done - something you can tell your grandma to do.

Unfortunately, it looks like that same tool could make it a bit too easy to disable Windows Updates altogether, which is not a good idea.

I'd rather endure some pain with going through the registry route, but apply a fix that addresses only one particular behavior.

There is also a registry fix that I came across recently.. even simpler.

Share please!

You can also turn all outgoing connections off by default in the windows firewall, then whitelist the couple of programs that actually need to access the internet.

Source code?

Not my project, but it works. No idea if source is available.