If you specifically need version 3.40 for older vehicles (pre-2011), it is often sold as a "service" rather than a free download to ensure the installation actually works on Windows 10/11. Autodata Technical Vehicle Data

(Open Source)

: The official Autodata Group website offers a trial period for their current digital manuals starting at 1 € for the first month . This is the safest way to access verified, up-to-date data.