We are trying to upgrade from 4.5.6 to 5.6.6 LTS. Already have a commercial license for SQALE. The latest version of Sqale plugin 2.7 ( http://www.sonarplugins.com/sqale) is not working on 5.6.6. Is there a version available for 5.6.6?
On the page you have looked you can read it is compatable until version 5.4. The plugin will not be updated anymore: it is replaced by the SonarQube Quality Model. You can find more details here.