This is the second release candidate for the 1.4.0 release. 1.4.0rc2 fixes several issues with heatmap and domstream playback as well as issues tracking page views using the PHP client. See the 1.4.0 release notes for full detail on the changes since 1.4.0rc1. To update your OWA install from 1.4.0rc1, just svn switch to the 1.4.0rc2 tag or download a tarball and copy the new files over the old ones. To update from a v1.3.x or earlier, follow the instructions in the 1.4.0 release notes.