I am using the latest version of Thrawns Revenge mod. I am encountering a difficulty, where I am stuck with Thrawn from era 3 as my leader. It is now era 4 and I have no indicator nor holo message that popped up that tells me that I can now progress to Dark Empire. There is also no such button that appears in the government tab. Am I doing something wrong, or what?

I am playing on the largest galaxy map where it is era progressive, starting from era 1.