open cmd.exe with admin privileges
> cd %PROGRAMFILES(X86)%\Microsoft\Edge\Application\[SOME VERSION NO.]\Installer
> setup --uninstall --force-uninstall --system-level
Prevent recurrence with some registry editing:
> create new key HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft/EdgeUpdate
> create “DWORD (32-bit) Value” and call it “DoNotUpdateToEdgeWithChromium"