It was possible to upload it to ftp. I uploaded it to my own website. Found it . It is containing all the websites, but not my ISPconfig database... Can I get the SQL of an empty version? So I can fill it with phpMyAdmin?
You can not create an ISPConfig database manually when you dont have the SQL-dump from your previous install.
No, that doesn't work because the installer fills the isp_server table on-the-fly with customized values for your distribution. But you can have a look here: http://www.howtoforge.com/forums/showthread.php?t=161&highlight=isp_server