after about 10hours downloading, i finally got the whole file in my computer.
however, the format of the digital file seems a bit wrong
i've tried twice, the result of both of the downloading process is a file, with exact same size, but the different format. it was supposed to be '.mp4', but it turned out to be '.fdmdownload'.
i'm pretty much the url i took to download file has no problem, so if you may plz check that

Hello,
.fdmdownload means that a file is not yet downloaded. This ending will be removed from its name once a download is finished.

Some sites may not provide complete file info with download link. In such cases you can see that download stops at 99% or the file has no proper extension.