A pre-invasion isn't possible because it isn't. Its not possible to rollback the game to those versions anymore, even Surak stated this in the forum somewhere.
Edit: Here is his post and translation:
Quote:
Originally Posted by surak
Lamento informarles que no existe forma de montar un servidor con una versión antigua del juego.
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English translation: Post
link.
Quote:
Originally Posted by surak
I regret to inform you that there is no way to mount a server with an older version of the game.
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I am closing this topic.