Hi,
I bought the expansion (I installed the v1.91, too) and I've played a round with it. I'm a bit sad, because I experienced some bugs.
1. There may be some memory leaks, because after loading the game, I often see lags in different parts of the game. In most cases a duplicated ALT+Tab helped to resolve it, but in the last some cases I've got an "Invalid call" error message during this action and the game flown out.
2. The combat viewer is flickering and flashing in certain viewing mode (Cinematic is sure), it seems that it cannot switch the viewponts, so both is flashing at the same time. I can use only Free mode.
3. It's a strange experience: the military starbase model diappaered from the game. I can't see it in the main map, nor on the icon neither in the intelligence report. I didn't use any mods. (The first time I built it was in the game, but at the second time I
lost. I reloaded a saved game before building the second one, but the
situation was the same: no starbase).
So, I think, this game needs some patches yet to be able to play it well. I'm waiting for it, this game worths that.