If a new update has been released (or is 'live') sometimes it will not be available yet to download or install on whatever device/platform you are using.
For mobile platforms (Android and iOS) - often updates take a while to propagate to the app stores, the AQ3D Team unfortunately does not have any control over this. Once the update shows that it is available, you will have to download and install it from the mobile app store.
For Steam - you should be able to download and install the update immediately. However, sometimes it may not show up yet, but it should soon!
Some updates require the newest version of the game in order for players to login and play. Always make sure you are running the newest version of the game to prevent any issues! Also, most updates require cache to be cleared, you can clear cache by hitting the settings button at the main login screen.