Hi,

I've installed the latest version of Zenphoto.
Can I block the image download for a particular user or group?

Thanks in advance.

If you mean the full image access, yes. Set Options > Image > Full image protection. You can also set a password for that.

Additionally you can modify the theme used to use the full image only if a user has the rights for it. Add if(zp_loggedin(VIEW_FULLIMAGE_RIGHTS) { … } around the link and give users or groups that right. Then only they can download.

Of course anyone guessing the full iamge link will be able to access it.

More info on user rights:
http://www.zenphoto.org/news/an-overview-of-zenphoto-users