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1. Download or make sure you have the current base game on GOG (it should say 2.2.0 beside it for windows and 1.1.0 for the other two platforms). This will bring you to game version 2.000 when installed.

2. Do not update the game further (there are versions past 2.000)

3. Install the Betrayed hope expansion (the game version will remain at 2.000).

4. update by usual means and enjoy.