You can add support for this site yourself.
Create a Linkcrawler rule that matches the URL you want JDownloader to parse (use board search)
and then copy/paste the login cookies from your Browser/Developer console to the rule, so JDownloader can access the page as logged in.
You can send me real example links you want to parse and forum logins, then I can help in creating such a rule.
Send details to
support@jdownloader.org