Allow downloads from Lightroom mobile galleries?

You need to enable on each public gallery separately.

Log-in to your web galleries, click on the blue sharing icon where enabled and in options put a check-mark in the box (bottom left) to permit downloads.

https://lightroom.adobe.com/

Thanks, this is exactly what I was looking for. Much obliged.

You can also click on an individual gallery on the left side panel and a gear icon will show up. The next window has a button that gives you the option to share. Then you can choose to share images and the download option will appear on the adobe mobile galleries.