formprocessorpro.pl - must be located at the cgi-bin folder or any other folder that has executable permission.

Config file - you can put this file to any place on your server.

Template files - you can put them at any place on the server. But all of them must be located in one folder.

Your form - can be located at any place. Even on any other server.

Please check all path variables carefully. This cause many problems. Incorrect path variables is the problem number one.

:: Set permission [using Unix shell command or any FTP program] ::..

Executable [read/execute] permission for formprocessorpro.pl file
Command in Unix shell:
chmod 755

Write Enabled [read/write] for files that need to be accessed for writing. For example DB or log files.
Note: In addition attachments directory must have write permission as well.
Command in Unix shell:
chmod 666