Thank you for reporting your problem. I was able to reproduce it on Windows 10 32bits following the tutorial, using RosarioSIS 3.2 and wkhtmltodpf 0.12+.
The PDF generation seems to be working when calling wkhtmltopdf from the command line but never stops when called from PHP.
We have no solution for now, will keep you updated.
For now, you could just empty the wkhtmltopdf path in the
config.inc.php file so you get HTML instead of PDF.