In order to install the rendering extension via command line, you should enter the C:\Program Files\Perpetuum Software\Reporting Services 2008 Rendering Extension for Silverlight Viewer\ (or the folder with corresponding files), you should write:
PerpetuumSoft.XamlExtension.msi /quiet INSTANCENAME=<instancename>
To remove the Rendering Extension from the command line you should write:
msiexec /X PerpetuumSoft.XamlExtension.msi /quiet INSTANCENAME=<instancename>
where <instancename> - the name of the server on which installation is executed.
For installation or removal of the Rendering Extension you need administrative rights.
The data about installation or removal are written to the system log.