I've seen that in extension section there are some description but no files, how can i add crop-image filter to my zenphoto?

Extensions that have no download are included in the release package. That is actually written on the legend on the sidebar...

I can't find crop filter in the release where is it in the admin panel?

It is the custom crop tool that each image has on the backend images list.
http://www.zenphoto.org/zp/screenshots/Zenphoto-1.2.7-admin-with-Zenpage-plugin/05-album-edit_images.jpg.php

I found it, I had to activate the plugin! thanks