Hello, i am newbie in Zenphoto. I need a function:

• user can view or search images and can mark them for download. When pressed "Download", it downloads full-resolution photos to a single zip file. I can't find this functionality (I searched in plugins but nothing found).
  Could someone please direct me?
  Thanks!

You can use the included downloadlist plugin for this but you may have to modify the theme used using this:

https://docs.zenphoto.org/1.5.x/function-printDownloadAlbumZipURL.html