It looks like the OS2Voice FTP server is down at the moment, I'm not sure when it was last online. And unfortunately I can't find that particular file archived anywhere else. Maybe someone else has it that can provide it, or perhaps send an email to the OS2Voice site owner. Although having tried to find that, it looks like the entire site is presently down!
https://www.os2voice.org is going nowhere for me at present - it might be worth giving it a day or so for Lewis to get the site up and running again.