If you turn off the checkbox that says show pre-release versions, you can un-install and re-install 1.2.
There is a bug in the load game code that causes too much memory to be allocated, and if the game is saved after loading, that memory becomes part of the save game, so the more you load and save the games, the bigger the game gets until Windows refuses to give GalCiv2 any more memory.
It is possible to avoid the bug if you don't have to save and reload.
I have fixed the bug here and it will be in the next update.
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