Fans say that the dropbox direct download is not working? What do I do?

There is a fix for this instead of just changing the 0 to a 1, delete dl=0 at the end of the dropbox link and replace it with raw=1.

Basically, what you are doing by adding the raw=1 to the end of the link is hotlinking it. That's is sharing direct download link to the file. Anyone who clicks on hotlinked file will not see any of the Dropbox frames, logos, etc. It works for any type of file that you share.