I'm not sure about the product catalog, but you might not need it (see next paragraph).
Any of the products that are included in your license should be downloadable from http://www.mcafee.com/us/downloads/downloads.aspx by entering your grant number in the box in the upper right corner of the page. Each product will probably have a documentation page and a patches page in addition to the software downloads page, so check all three. Any product that has policies and/or reports will include extensions (.zip files inside the downloaded .zip file) which must be installed via ePO's Extensions page (Menu->Software->Extensions).
Virus definition files ("DAT files") and engine updates can be downloaded from here: http://www.mcafee.com/apps/downloads/security-updates/security-updates.aspx?regi on=us; choose the one that says "for use with McAfee ePO".
Documentation for ePO and other products is also available at http://www.mcafee.com/us/support.aspx by clicking "Product Documentation" under "Corporate Support". The same page also has a link to KnowledgeBase articles.