See the changelog here. Download Epsilon here. Installation instructions here. There are a significant number of bug fixes in this release since the Delta release. Please remember, these releases are not official Fabrik 4 production releases (although there are many sites running them in production). We make no guarantees that they will work completely in your specific case. Please test on a test copy of your site before installing on a production site. If you find any errors please post them in the bugs section of this forum and we will do our best to try and fix them.