Install a package manualy into vendor folder with zend 2

I need to use ‘phpword’ package with a zend 2 project but I can’t install this dependancy with composer and I want to install it manualy, (copy package folder to vendor folder) but I have an error like “Fatal error: Class ‘PhpOfficePhpWordPhpWord’ not found in …” . I already load autoload.php file.

Someone have a tips for this please? Thanks