If you choose to install the PDF Printer Driver inside of PDFtypewriter, then you won't see this dialog as the main installer will have already installed the Add-In per your preferences.
 
After installing the PDF Printer Driver (assuming you denied to install it in the main installer), you will be prompted as to whether or not you want to install the Plug-In.
 
If you wish to install the Plug-In at a later day, you can go into the PDF Printer Driver configurations and click (Re) Install Add-In.
 
To Remove the Plug-In at any time run the PDF Printer Driver configuration and click Uninstall Add-In. The Add-In will also be removed upon uninstallation of PDFtypewriter.
 
The Add-In for Word works best with Microsoft Word 2000. It has also been tested to work with Word XP and Word 2003.
 
This Add-In also will install itself for MS Excel and MS PowerPoint.