You did not succefully installed ispconfig, otherwise you would have been able to login into ispconfig on port 8080. The files you copied may not be copied there! So delete them.
With that, i tried accessing it via ftp and there were no folder in sight.
You can not access the ispconfig installation files with a FTP user. Thats not intened.
ISPConfig is a server control panel and not a cms that you simply copy somewhere. ISPConfig has a installer and it copies its own files to the correct directories. So if you copy any of these files to another directory, you just mess up the setup.