Is your FTP program giving you the error or the installation?
If it's the installation, make sure the file is named and formated perfectly. If you didn't the first time, just download the version they provide instead of creating your own. Also, double-check to be sure the file is in the correct directory: /home/perihelion/domain.com/photos/ Finally, be sure the login.txt file has the correct read/write permissions (644 / rw-r--r--).
If you're sure you've done it all correctly, you can always ask for customer support, or just delete everything and try again.