bbpress problems in www.ads-software.com

I tried to start a new topic on a plugin called stapress reloaded via the page https://www.ads-software.com/tags/statpress-reloaded#postform . When I try to submit a new topic, bbpress gives me an error page saying “Topic not found.”. Also, there is a question on that page saying “Select the version of WordPress you are using”. However, version 2.7 is still not available in the list!