Save the following text as “block-win10.reg” and double click to run it
Windows Registry Editor Version 5.00 [HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\GWX] "DisableGWX"=dword:00000001 [HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate] "DisableOSUpgrade"=dword:00000001
or download the file directly:
http://program.tiger-workshop.com/blog/block-win10.reg
Reboot after run. Yeah. That SHIT is gone!
Source: https://support.microsoft.com/en-us/kb/3080351