1) Invalid/unofficial game version

Solution: Please make sure you have downloaded the game from the official store (Google Play Market/AppStore). We cannot guarantee a smooth performance if you have downloaded the game from other sources.

2) The updating process is not complete yet

Solution: Wait a little bit. The update itself is a complicated process that depends on multiple factors. Sometimes it takes a little longer to deliver a new version (the process can take several hours).

3) The update is unavailable/not visible for you

Close the game and find its page in the official store (Google Play Market/AppStore). If you see the "Update" button there - push it. If not - clear the cache (for Android devices), reboot your device (turn it off and on again), and check the game's store page again.