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I am trying to do a clean install of Revit MEP 2012 to bring in the plugin for Navis 2012 but i cant get Revit MEP 2012 to uninstall, when I try to reinstall it from the thumb drive it says it is allready installed.
This is usually the result of a left over registry key making the installer think the program is still installed.
I would use a program sucah as CCleaner which can sometimes clear out any remaining data.