No, it's not necessary to download anything at all. All games in our database are browser-primarily based and don't need any download or installation. That said, some more mature games involve Flash player, so You could have to setup it if you'd like to play Some games and haven't got https://docs.google.com/forms/d/10TO1vZkFaZy_Gp5h0AmfIteMMATf7b20tM4YWuK6a74/edit