where FILENAME is full pathname of <code>.tex</code> file you previously create in Gramps. The MiKTeX package manager will then automatically download the missing packages. When all is finished pdf file will be created in directory in which you start this command, along with two other files of the same name but with different extensions (*.log) and (*.aux) which you can ignore.

If everything goes well you will now have option in Gramps to output the reports to the PDF(".pdf" extension) format and the bultin latex(*.tex) format.