Thrawn's Revenge is a large-scale mod for Empire at War: Forces of Corruption. It includes the events of the Galactic Civil War after Palpatine's death at Endor, up until the signing of the Pellaeon-Gavrisom treaty. If you own the Steam version of EaW, you will have to complete extra steps to run the mod after installation. Please see the manual for these steps.
We've released a beta for the upcoming patch for ICW on our forums for testing before we do the full release. It can be downloaded from our forums at the following link. Please report any bugs, as that is the point of a beta.