On Friday, December 16 2016 at 04:02 CET, I received the following email:
Originally Posted by Dropbox Email
Hi <Your Name>,
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
This means if you are currently running your sv_downloadurl via your pre-June 2012 Dropbox account, using one of these two links:
Then your sv_downloadurl will break after March 15, 2017.
It might make sense for you to ensure that you are fully migrated away from the Dropbox URL before this date.
UPDATE May 2, 2017
Paid accounts (e.g. Dropbox PLUS (1 TB)) seems to have an extended period until September 1, 2017 (not officially confirmed!).