Here is the save file:
https://drive.google.com/open?id=0B3deOhlG3pVmNU1vdFJBWlNxNU0&authuser=0
Offer peace to the Drengin, and then keep adding their stuff. They will eventually decide that once they give you enough stuff it is no longer too much, but just enough.
You can just take everything from the Altarians and Terrans in the same way, but you don't see them yet (until you take all the Drengin planets). For some reason no other race will even let you talk to them in this turn.
Here is the file from the support tool:
https://drive.google.com/open?id=0B3deOhlG3pVmZ3JlQmhRUGZMUlE&authuser=0
Let me know if that does not work.
