Old versions download

HI just got the Cubase 6 upgrade from Studio 4. As I understood, the license also runs all previous versions. Where can I download the full installers for the old versions, I’d like to install 3.1, 4 and 5 alongside 6 for maximum compatibility.

Apart from SX 3 (As for the reasons explained here), you can´t download any of the full installers, you´d have to own them, or know anyone who owns them and is willing to provide them to you