If you have been given a link to download you files, you can download individually or in groups.

To download an individual photo, click on it to make it large.  At the top of the photo, you will three icons.  A heart to like it, a share icon and a download icon.

Click on the download icon and you will be asked for a password.  
If you want to download multiple photos, in the gallery view, click on the word  "Select Photos" on the Top Right.

Then select "Download".

You will be given the opportunity to download the entire gallery, or select photos.  The website will then give you a link to a ZIP file.
Because this file can be quite large, it will ask you for a email while it makes it in the background.  When it is finished, it will send you the link. 

Do not download from the "VISIT SHOP" menu on the Right hand side, this will try and charge you.