Official info page for this release: http://b2evolution.net/downloads/6-4-2-beta (updated even after release)
This is a beta version.
"beta" means there may be a few bugs, but globally it works. There are definitely some details we still need to polish out, but we're pretty close to our goal for b2evolution version 6 here.
Installation
Our easy installation guide will provide step by step instructions to get you started with b2evolution:
http://b2evolution.net/man/installation-upgrade/new-install/installation-guide
Upgrade
If you want to upgrade your installation to this beta version, see: http://b2evolution.net/man/installation-upgrade/upgrading/
IMPORTANT: many root files are no longer needed in this version and should ideally be deleted from your web server. Also, you should use the provided tool to convert your database to UTF-8. Please check this for instructions: http://b2evolution.net/man/installation-upgrade/upgrading/instructions-for-specific-versions/upgrade-to-version-6
Changes
Please see: http://b2evolution.net/downloads/6-4-2-beta