Sure you can install this whenever. It only reads a savegame and operates external from the game. If you set the options right it can add markers on the in game map (modifies special files that are part of the samegame so you have to reload it), but other than that it doesn't modify the game.
The Tatukgis view is only needed if you want to see the contact and intelligence markers on a nicer map with color and flag coding. As the marks on the built in map just plain pencil marks with modified text. So it's just a fancier way of showing the data external from the game.
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