2.8 but this doesn't necessarily mean that I have this patch, imo. I cannot believe that Stardock, in 3 years, never fixed the fleet bug. I cannot make a fleet from 4 stacked ships where I have enough logistics to make any 2 into one fleet and the only posts on the internet related to this problem are from 2015.
Plus I have many other bugs that appear as first release bugs. The game is unplayable in its current form.