Download Buttons (Single Picture & Whole Gallery)

Ahoy !

Would it be possible to add a button at the beginning or at the end of the gallery for clients to be able to download every pictures as a whole (.zip / .rar / etc…) ? I got several returns from clients saying that it would be easier for them. Got to send them wetransfer.com or mega.co links at the moment.

Also, it seems like the source button would be more effective as a download one, because clients usually click on it and get to the full-size picture and don’t really know what to do after that 😉
(extra suggestion: adding the download button on hover would be great ! :D)