I kept getting the error before but when I tried again things usually installed.
I already downloaded it to my computer. I have now unpacked it then uploaded it.
I got an error on one file: Warning: ftp_put() [function.ftp-put]: Could not open data connection to port 54069: Cannot assign requested address in /home/mainhost/public_html/file-manager/includes/filesystem.inc.php on line 2566
The plugin is not listed under plugins...