I just installed the plugin and I 'm making tryals at this moment. The site is not visible for the normal people, but you may see it at http://www.coalize.it/wordpress/
Strange enough, in the eShop admin screen I get somethig like this:
Warning: file_get_contents(/.../wordpress/wp-content/plugins/eshop//eshop/files/eshop.css): failed to open stream: No such file or directory in /.../wordpress/wp-content/plugins/eshop/eshop-style.php on line 83
I've seen that the file exists in the server: some idea?