Extra sizes
You can specify extra sizes which will be also generated during "Make album". The link to these sizes will be added in the lightbox's info panel.
Offer download as ZIP for
You can offer visitors to download a complete folder as ZIP. Scaled-down images option ZIPs the lightbox-sized images, Originals collects all originals in the ZIP, while Included originals collects only originals that you select with right-click → Include original. If image linking is set to "Link originals via scaled images", all originals will be included with both latter options.