If you wish to not install Windows 10, and also prevent the sharing of installers off your connection, you will want to make sure not to / remove the KB3035583 update.
I am considering a Windows 10 test install, but not to wipe over my main windows install. However the use of my connection, a la Xbox Live methods, is not so much in my interests.
Here are some extra GWX details.
Without making this a huge rant of observations in Windows 10 thread, I will say that the privacy controls need to actually not phone back to microsoft servers, when you set the options that are supposed to disable that feature. Also automatic forced updating is not my cup of tea. I believe in testing.
Call me crazy.