Did you download a zip file but it seems to be empty? This happens when a file doesn't download completely. Since some of our files are large, it may take a few extra minutes to fully download.
Solution: Rename the partial download on your computer. Login to your account and download again.
Also, please note that in some cases there may be multiple nested folders inside a single download, and it will be necessary to open all the folders to access all the documents contained within them.