Seems none of the older members (who actually saw the File Manager in action on the old server) use it, so I won't install. As far as 4th Class goes, what's the prob with command line FTP? Doesn't it work for you?
BTW there is an old post from June in which I described step by step how to upload with command line FTP. I've now stickied it and updated the instructions a bit with the changes since the latest server migration.