As we can see they are the same versions: ff we click the download links here above in this present page, we arrive... simply at the Challenge 2009 page. And the page hasn't been updated as we see that the download links are the same:
Description of the download links:
HybridReverb2 for Debian Lenny (IA32) (13.95 MB) Last updated: Sun, 25 Oct 2009 10:10:14 -0700
HybridReverb2 for Mac OS X Leopard (IA32) (14.51 MB) Last updated: Mon, 26 Oct 2009 16:43:36 -0700
HybridReverb2 for Ubuntu Jaunty (IA32) (13.96 MB) Last updated: Sun, 25 Oct 2009 10:28:41 -0700
HybridReverb2 for Windows (IA32) (3.41 MB) Last updated: Wed, 04 Nov 2009 10:48:01 -0800
And there's no other place to find more recent versions.
In fact, it is probable that the developer has just realized that he had never created a page in the KVR Database, and he has just done it yesterday.