Any attachments posted prior to November 2017 have been lost
https://forum.singularsound.com/t/beatbuddy-discourse-forum-error/5757?u=ghostofweedon
If the file you are looking for is not covered by the list in this post, you can add a reply to the original post requesting the file to be re-uploaded and hopefully someone will have a copy or perhaps point you to an alternative.
There is another version of Brown Sugar