NetPBM is not installed in a central location on the server because ImageMagick can usually be used instead in most scripts and is installed on all servers.
If NetPBM is important for you and you need it installed the binary can be installed in your webspace with no intervention from us. Simply download the file here, extract it using Winzip/WinRar and upload it to your top level directory into a newly created folder called "netpbm". In your script, provide the path to this folder when asked for the path to NetPBM which should be: /home/username/netpbm (replace username with your actual username).
