Recently, there has been calls pertaining to integration issues with ProjectWise Application integration and the add-ons modules, such as Office 2013, Revit, etc.. When you download the Add-on from the SELECT download site the file gets downloaded and appears to run the .exe. This is where people are becoming confused and think that the module has "installed". This is not the actual installation. You will need to go to the c:\Bentley downloads directory, double-click and run the .msi for the integration/add on module to be installed.