Data Packs can be downloaded from inside the game by selecting "Statistics" in the main menu of the game. You can always check whether all updates have been installed successfully by visiting "Data version" inside "Option".
To make sure that your game is up to date and that you can use all available modes and features, you need to install the most up to date Patch and Data Pack. Remember to always update the most recent Patch first before downloading an available Data Pack. More information on patches can be found here.