DotNetNuke 6.1.3 is the recommended and supported version of DotNetNuke.
DotNetNuke 6.1.3 is the newest version of the DotNetNuke framework and with over 600 bug fixes and over 30 new features/enhancements, this is the most impressive version of DotNetNuke to date. With expanded security capabilities, better content administration, and faster performance, DotNetNuke 6.1.3 is the next generation of the DotNetNuke web application platform.
While DotNetNuke 6.1.3 has been thoroughly tested and is recommended for production, it is a significant upgrade from DotNetNuke 5.x. If you are upgrading your website from DotNetNuke 5.x, you may need to upgrade third party components to DotNetNuke 6.x Compatible versions.