FTP site is basically being discontinued. There are previous threads about this.
I used to update my installers by doing "copy /u" from the ftp address. "copy /u" doesn't work with http addresses, unfortunately. I switched to a batch file based on what I saw in previous threads and modified it a bit. the batch file downloads the update.aiu file, reads that file to see what version is on the web site, then downloads the installer if it's a newer version than what I have already. Works well for me.