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Yeay! After so many years.
I don't know if it's the game itself, or the fix patch I applied, but the last mission is bugged. Looking at the wikia's map, there should have been walls forcing me into a kind of spiral path. It was not the case, I had direct access to the central room. Also, upon completing the objective, I didn't get the cutscene to play, it sent me back directly to the main menu (I had to go find it on Youtube).
Kind of an anti-climactic way to end this... :(
Vanilla TFTD? I'm surprised it didn't crash. Maybe you can import an older save into OpenXCOM and take a swing at victory again?