Hi,
Was a bit confused by this too. You can find the change log by going Developers > Current Version > 4.3.9 on the plugin page and clicking the svn link. If you then click “history.txt” you can view the change log. ( https://plugins.svn.www.ads-software.com/better-wp-security/tags/4.3.9/history.txt )
The following changes have occurred since 4.3.7 (the last version in the change log link):
4.3.8 - 2014-08-11 - Packaging Bot (core)
Ensure that individual module updates fire when updating the plugin
Added function to retrieve current URL from the front-end
4.3.9 - 2014-08-11 - Packaging Bot (modules/free)
Remove error message if WP_Error is returned with wp_remote_post in malware scan
Fixed bug where away-mode was still enabled after one-time period has passed which could result in away mode activating when it should not
Fixed error in brute force protection that counts valid logins with XML-RPC as bad logins towards a brute force lockout.
Hope this helps ??
Joe