I want to upgrade my current game running under version 0.31.25 to the latest version 0.34.02. Is there a safe way to do that?
No, there isn't. The last two update are not savegame compatible ,0.31 to 0.34.01 because of the mass of changes, 0.34.01 to 0.34.02 because of corrupted savegames:
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