The easiest way to get this library is to use Composer. While having Composer installed it takes only composer require dolejska-daniel/riot-api to get the library ready!

If you are not fan of Composer, you can download whole repository in .zip archive or clone the repository using Git - git clone https://github.com/dolejska-daniel/riot-api. But in this case, you will have to create your own autoload function.