I decided to try "Spybot anti-beacon for Windows 10"
which apparently prevents telemetry from Windows 10 and it seems to do just that.
But I think it may also prevent Windows 10 updates too. .......
I downloaded the anniversary update and tried to install it. The install process did the tests, all of which passed but after downloading, the install failed repeatedly with error code 0x80070057. I "think" that might be because without telemetry Microsoft may not know if this is a valid installation. But that is a guess. Does anyone know?