Plugin for Imperavi Redactor v10.x.x -- Insert image by link (feature is missing by default)

redactor.imagelink.js

/*
	Add image by link plugin for Imperavi Redactor v10.x.x
	Updated: January 21, 2015

	Copyright (c) 2015, Alexey Kinev
	License: The MIT License (MIT) http://opensource.org/licenses/MIT

	Usage:
        	$('#redactor').redactor({
        		imageUpload: false,
        		s3: false,
        		plugins: ['imagelink']
        	});
*/
if (!RedactorPlugins) var RedactorPlugins = {};

(function($)
{
	RedactorPlugins.imagelink = function()
	{
		return {
			getTemplate: function()
			{
				return String()
				+ '<section id="redactor-modal-imagelink-insert">'
					+ '<label>' + this.lang.get('image_web_link') + '</label>'
					+ '<input type="text" id="redactor-insert-imagelink">'
				+ '</section>';
			},
			init: function()
			{
				var button = this.button.addAfter('underline', 'image', this.lang.get('image'));
				this.button.addCallback(button, this.imagelink.show);
			},
			show: function()
			{
				this.modal.addTemplate('imagelink', this.imagelink.getTemplate());

				this.modal.load('imagelink', this.lang.get('image'), 700);
				this.modal.createCancelButton();

				var button = this.modal.createActionButton(this.lang.get('insert'));
				button.on('click', this.imagelink.insert);

				this.selection.save();
				this.modal.show();

				$('#redactor-insert-imagelink').focus();
			},
			insert: function()
			{
				var data = $('#redactor-insert-imagelink').val();
				this.image.insert({filelink: data}, false);
			}
		};
	};
})(jQuery);

What version of Redactor does this work with? I'm using 10.2.5 and when I click on the Image button, I'm just asked to "Drop file here or Browse". Shouldn't it ask for the link to the image instead?