Check out this tutorial if you are having trouble installing Mass Effect: Unification and you own the Steam version of Star Wars Battlefront II.
installing unification (r1) with the steam version of swbf2
Total-conversion mod that adds the Mass Effect era to Instant Action. You can fight as the Systems Alliance, the Heretic Geth, the Collectors, or the Evolved Geth on three new custom maps, all of the stock maps, and all maps from the Sol Map Pack.
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