Windows 7/8: Disabling Windows 10 Upgrade
By default, Windows 7/8/8.1 systems which are not domain-joined, serviced by WSUS or an “Embedded” or “Enterprise” edition will be prompted to upgrade to Windows 10. Although the Windows 10 upgrade is quite reliable, and Windows 10 is highly compatible with existing applications, there are circumstances where allowing the upgrade to proceed is undesirable.
To disable the upgrade and various prompts:
- Open an elevated command prompt.
reg add HKLM\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate /v DisableOSUpgrade /d 1 /f /t REG_DWORD
reg add HKLM\SOFTWARE\Policies\Microsoft\Windows\Gwx /v DisableGWX /d 1 /f /t REG_DWORD
reg add HKLM\Software\Microsoft\Windows\CurrentVersion\WindowsUpdate\OSUpgrade /v ReservationsAllowed /d 0 /f /t REG_DWORD
Also see How to manage Windows 10 notification and upgrade options.