supsystic on "[Plugin: Photo Gallery by Supsystic] Download of pictures from Gallery"

Hi,
I have installed Photo Gallery by Supsystic and everything works great.
But I have little problem. I don't know how to enable for users to be able to download pictures from my gallery. When I open gallery there is no download button and when I click right mouse button, there is no "Save picture as" option.
Here is a link from my gallery:
http://aliszp.ba/galerija/vi-kongres-akreditacija-u-zdravstvu-19-22-maj-2016-godine-neumbih/
Thank you and best regards

https://wordpress.org/plugins/gallery-by-supsystic/

Hello!
I just checked your gallery and was able to save preview image - http://ptscr.com/bbbn2v

Unfortunately you cannot save image from popup due to popup structure. In order to popup looked so nice - pictures are overlapped by other elements of popup themes, therefore you cannot save them from popup. We can offer you to make screenshots of your images in popup.