Make sure the new user hast sufficient permissions for the "old" pages. In most cases adding the user to the guest-group solves the problem. Otherwise the user may have less permissions than a "simple" guest.

This behaviour is correct. Propably, you just didn't set up the template of the page for the new language. Do this by editing the page-properties using the module pages. Afterwards, loading the site in the portal should complete with the desired result.

Yes! You don't have to link to Kajona within your template, not even in the imprint of your site.

The only limitation provided by the licence is, that you don't remove the copyright notes in the source-files (mostly PHP and JavaScript files). Since they are added as comments, they won't get visible to the users.

Kajona 3.4 no longer supports the mysql-driver, it was replaced by mysqli. To activate the new driver, open /system/config/config.php and replace the mysql-entry by mysqli.

In this case, PHP was installed with mb_string but the function mb_ereg seems to be missing. To use Kajona, the file /system/functions.php should be opened with a text-editor. Then, replace the following section at the files' header

 //Mbstring loaded? If yes, we could use unicode-safe string-functions
if(!defined("_mbstringloaded_")) {
       if(extension_loaded("mbstring")) {
         define("_mbstringloaded_", true);
         mb_internal_encoding("UTF-8");
       }
     else {
         define("_mbstringloaded_", false);
     }
 }

by

 //For the sake of different loaders - check again :(
 //Mbstring loaded? If yes, we could use unicode-safe string-functions
 if(!defined("_mbstringloaded_")) {
         define("_mbstringloaded_", false);
 }

Afterwards the system can be installed without further problems.

This error occurs due to a problem with apache, in detail with the apache-module "mod_rewrite". Please try to rename or delete the ".htaccess" file based in the root-directory of your installation.