1. Go to this page and download the library: Download studionoir/translingua library. Choose the download type require.
2. Extract the ZIP file and open the index.php.
3. Add this code to the index.php.
<?php
require_once('vendor/autoload.php');
/* Start to develop here. Best regards https://php-download.com/ */
bash
php craft translingua/license/set-edition plus
php craft translingua/license/set-edition standard
php craft translingua/license/edition # prints the active one