The preferred way to install this extension is through composer.
Either run
php composer.phar require --prefer-dist nick-denry/yii2-ckeditor-roxyfileman
or add
"nick-denry/yii2-ckeditor-roxyfileman": "^0.1.3"
to the require section of your composer.json file.
Project inspired by navatech/yii2-roxymce. Thanks to @phuong17889