Hearthstone has been updated. Please download the latest version.

This is caused by your account having been used on a version of Hearthstone that is newer than the version you have on your mobile device. To continue playing, the Hearthstone version on your mobile device needs to update. Ensure your mobile device correctly updates to the newest version of Hearthstone and try again.

If the previous troubleshooting steps didn't resolve the problem, you can ask the Blizzard player community for help on the tech support forums (if available) or other community gaming sites. Local computer or network technicians may also be able to help if you've exhausted all other resources.