materials library reinstall

[trompher]

I was having problems with modified materials in revit not appearing in renderings.  The solution I came across was to delete all of the 2011 autodesk materials libraries and then reinstall them.  I uninstalled them just fine but the reinstall method requires inserting the product media and installing only the material libraries in a specific order.  The problem is I'm a student and I downloaded my free trial of revit so I don't have a cd or media.  How do I reinstall the materials libraries that I need now?

[hashim.mundol]

If you haven't deleted manually, installation source should be in C:\Autodesk\

if not you can download the trial version and extract it