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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?
If you haven't deleted manually, installation source should be in C:\Autodesk\
if not you can download the trial version and extract it