Go to this page, use Google Translate. You must use a special program, maybe even join the site. There is a FAQ. This first one, when clicked, has a link in it's last word to Deposit Files where you can download the program they require. You will have to take it from there. I have not tried it as I am not interested in Downloading it, but I don't think it is very difficult, as I stated, you may have to join the forum, I don't know, sorry.
You have to join the site for download. I would recommend using Google Chrome, because of the universal automatic translator embedded in it.
Once you join, you'll be able to access the site's download section. This site http://noturnosukhoi.blogspot.com.br/ has a "how to" tutorial (you''l have to search it m though, it's an old post)... It's in Brazilian Portuguese, but you'll be able to follow it through a simple translation.
I hope this helps!