Welcome to the club. I have attempted to use these FTP server sites off and on for the past 6 years and it is a frustrating, tedious and time-consuming job that more often than not turns out unsatisfactory. Maybe it has something to do with the size of the file, I don't know. Dropbox may be the sole exception in that it seems to work most of the time for downloads whereby the user is transferred to a separate URL instead of trying to do it directly from the FTP server. Perhaps someone here can address this matter so more users can work with this material. In my day 30 to 40 years ago, we either had to buy the NARA rolls, which back then were $15 - $25 each, or borrow them from research libraries through interlibrary loan.