Add a "Download" option when right-clicking on a folder in the Media Folders tree on the left of the Media Library. It would have two options:
1) Download > Folder
2) Download > Folder and Subfolders
Because Media Folders organizes files using metadata, there's no easy way to download the contents of a "folder" using other file manager plugins. There are times when content editors need to update a large number of files and downloading each of them individually takes a very long time.
Thanks for considering this enhancement.