Hello Adventurers,
We wanted to give small update with the 6.2 Update early release on Amazon.
Unfortunately after talking to Amazon and looking into this, once an update is released on a platform we are unable roll the update back to the previous one. This means that we cannot revert the Amazon Store to go back to the 6.1.5 update.
We apologize to the players who have been affected by this. We are putting in steps to try to prevent this happening again in the future. We are also currently looking into compensation for Amazon players once the 6.2 update officially releases.
As Jeto has mentioned, the dev team is investigating why some players have been experiencing problems with the apk that has been shared. The apk should be the same version as the one that was available on the Amazon Store originally.
Currently we suggest that affected players, either downloading Google Play on your Amazon device to try and download the game that way (as shared by @s-wolff).
Or if you have set up account linking for your account, you can use it to play on an alternative device such as Steam, iOS or another Android device using account linking.