Yes indeed, i've just seen the same download problem on my on PC. Cliclking on the Download button does nothing at all!
Some web topics say it's because of bandwidth limit exceeded, some others are not even seriously answered by the help desk.
Finally i've tried below alternative method with success in Chrome Browser:
1) Copy the link
2) Open an new incognito tab (A regular tab may not work!)
3) Paste the link
4) Manually change "app.box.com...." address to "m.app.box.com...."
The trick is to simulate a mobile browser. As some blog visitors had reported they've got the same problem on PC but not on their smartphones, there should be something related to the O/S. Why it works on Android and not on Windows remains a mystery. I'm boxed...