Il2 1946 Mods
Il 2 Sturmovik
Sorry I took this long to reply, but here's my explanation of both: HSFX adds more planes and jets, and you can fly the unflyable aircraft, as they add controls and cockpits to them (For example, you can now fly the C-47 or Ohka with HSFX), and you get more skins, but it's just the usual Military ones for the added aircraft. They also add some more weapons for the aircraft. As for Ultrapack, basically they combined ton of mods and called it Ultrapack. They both make single player less boring, though I only have HSFX. But once you get the new mods, you'll have trouble getting into non-modded multi-player servers in Hyperlobby, and I haven't really seen any improvements in AI, so I think it's the same. And the graphical thing, yeah, it does improve some aspects, like the cockpit, and the terrain in maps along with changing/modifying skins for the planes in the un-modded version of the game. I hope this explains everything.
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Il-2 1946 includes all of the original IL-2 series content: IL-2 Sturmovik™: Forgotten Battles, Ace Expansion Pack, Pacific Fighters™ and alternate histry.