Install it and run, create one of several type of reports in
Reports->Trees menu. Make sure to select large inaf paper size in
options as those report currently don't scala well.
As output type only LaTeX is available and report will create file with
".tex" extension, remember their name and location.
During install select "install for me only" and "Install missing
After successful installation (it can take some time) start console
window (cmd.exe) and type:
where FILENAME is full pathname of .tex file you previously create in
Gramps. MiKTeX package manager will automatically download missing
packages. When all is finished pdf file will be created in directory in
which you start this command. I recommend then that you run "MiKTeX
Settings" from Windows StartMenu and change "on-the-fly" settings to
"No" or "Always ask"
If everything goes well you will now have option in Gramps to create
such reports in both latex and pdf format.