Bonum necessarium extra terminos necessitatis non est bonum
Being naturally helpful types, we phoned the company, which makes software, to point it out.
The link in question was the one pointing to details of this week's security updates, which, it transpires, has a missing 's'. On the offchance that Microsoft hasn't got round to fixing it yet, the correct URL is here.
The Inquirer. We're always here to help. Ourselves. µ