>automatic downloads of the 64 bit versions, not available on the discs,
If you are talking about things like templates and menus and such... these discuss those files... I think only for CS6
There are TWO links for missing Content... PPro & Encore basic and Encore extra
http://helpx.adobe.com/x-productkb/multi/library-functional-content-mi ssing.html
Encore additional http://helpx.adobe.com/encore/using/download-library-content.html