The Maelstrom Mod introduces four new races to the Sins of a Solar Empire Rebellion Universe. They are independent of the original races and have unique strengths and weaknesses. Maelstrom is available for Rebellion, Diplomacy, Entrenchment and Original Sins.
Original Expansion Series - includes a new Capitalship known as a Dreadnought, a very large and powerful Capitalship that once at level six or beyond can be upgraded into a Super-Dreadnought. Dreadnought's are automatically and repeatedly built by a special factory ... only one unique factory is made available for each player at the start of the game. Also included in the expansion series are more aggressive Pirates capable of colonizing. Finally beware of dangerous asteroids which fill the gravity well of various planets, they can severely damage fleets through collisions.
For some reason i dont see the menu buttons when i activate the mod,there is something wrong with "Window\" folder.
Have you got Sins patched to 1.193?