The licence-thingy now works fine, thank you.
But unfortunately the admin-account creation still doesn't work.
I tried several times, but everytime I click on Create (After I filled the form with Username Password Password), I just got a message because of a Major Security Issue (delete installer.php).
I downloaded the newest version out of the download-area, and updatet all the installer-files (installer.php and those in the lib/installer-folder).
MySQL Version is 5.0.51a , PHP 5.2.5
http://harthas.aufserver1.hieriminternet.de/nb/installer.php If you wanna try - dbconnect.php is already set, database is still empty.