How can I transfer my save from one version to another?
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If the version of the game is for Windows or Linux, then you can simply roll a new version of the game over the old one with a replacement.Or transfer folder Aliens in the Backyard\www\save from the old game to the new one. If the game is for android, then no way. If you have a save before version 19.3, then you should have installed the apk(old) and then the save would have been picked up. If you deleted the game from your phone, then that's it, the saves are lost.