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.
Unfortunately, while most of the testing process has been going very smoothly and we've made a lot of headway, some people have started to report save crashes in the beta, so in the interest of making sure the mod is as stable as possible, we have decided to move back release by two weeks to April 12th in order to try to look into it more. We will continue running the beta off of our forums for the time being, so those who do want to help test can do so there.
We're sorry for the delay, but we want to make sure once the release happens, it's as good and smooth as we can make it.