For those of you that are still using Dropbox for your server's download links:
I received an e-mail from Dropbox,
The gist of it all is that they're discontinuing the Public folder on March 15, 2017 and all files in user's Public folders will become private. This means that your links will be expired and no longer working for many people who use dropbox as their uploading source. You can still upload your files to dropbox outside the public folder and copy their new sharing links. Just tipping off anyone who doesn't read their 1000 e-mails a day
We’re always looking to improve the Dropbox sharing experience. The Public folder was the first sharing method we introduced, and since then, we’ve built even better ways for you to share securely and work together with your team.
As a result, we’ll soon be ending support for the Public folder. Dropbox Basic users will be able to use the Public folder until March 15, 2017. After that date the files in your Public folder will become private, and links to these files will be deactivated. Your files will remain safe in Dropbox.
If you’d like to keep sharing files in your Public folder, you can create new shared links. Just make sure to send the new URLs to your collaborators.
In addition to shared links, we have a number of sharing options designed to make collaboration easier and give you more control. To learn more, visit our Help Center.
The Dropbox team