pff..
There are 2 types of file hosting services: good and bad.
Using good service, you can download the file. Probably, it is difficult, but it is possible.
Bad service creates visibility of existence of the file, but you can't download it.
This my opinion, you can't overpersuade me.
I don't like to use dropbox because I often delete files from it.
And I hate .tar.* . I can use zip if it is so important.
Why should people bend over backwards for you in particular? Let him upload the file in the way most convienent for him.