John,

you most likely need to find media no. 51043575.
It's the latest Installation Master for 6.20/6.40 based products. Search for this number here.
If you don't see it with your S-user, let me know as it could be a permission issue.

Check these SAP Notes as well:
969660 - 6.40 Patch Collection Installation : Unix

967124 - 6.20/6.40 Patch Collection Installation: Windows

There is a wealth of related SAP Notes, e.g. in combination with various databases. I recommend
consulting the ones that fit to your project. Especially Oracle and here Oracle 11 with a 6.40 system
is kinda sensitive as it requires a different installation media (not the 51043575).

Regards,

Hendrik