Please remember to setup Python CGIs on your webserver.
If you use Apache, you can copy this snippet into your http.conf file:

Alias   /biocase                        "/var/www/gbif.irb.hr/provider_software_3.2/www"
<Directory                              "/var/www/gbif.irb.hr/provider_software_3.2/www">
    AllowOverride                   None
    Order                           allow,deny
    Allow                           from all
    Options                         +ExecCGI +Indexes
    AddHandler                      cgi-script cgi
    AddHandler                      cgi-script py
    DirectoryIndex                  index.cgi index.py index.html
</Directory>

Please test your installation at http://gbif.irb.hr/biocase/