Question How do you save the configuration? !!!

I think this is the common denominator. Like Cerberus, I, too, never use tarball archive packages. These kinds of archives are mostly useful if you want to copy the source code to examine them for yourselves (on a Unix system) not for the purposes of installing Kunena with Joomla's installation procedures.

Thank you for this information. I will post a warning in the known issues thread.