You will need a torrent client to download games on this website. So make sure you have one on your computer before starting to download the games. You can download the best and effective bittorrent clients here in this page.
For ad-free client the best you can download is Qbittorrent. The qBittorrent project aims to provide an open-source software alternative to µTorrent.
If you are having problem downloading with Qbittorrent alternatively you can use µTorrent. Tiny and easy to use but with ads.