The developers, 1C Game Studios , occasionally offer entire modules for free during special anniversaries.
If you are looking for a low-cost entry point, is frequently available for just a few dollars. Free to Play Version, or Demo Version. - General Discussion
Unlike competitors like DCS World , the modern Great Battles series does not currently offer a permanent free-to-play base game.
: In May 2025, to commemorate the 80th anniversary of Victory in Europe, the IL-2 Sturmovik: Battle of Moscow module was made available to claim for free for a 48-hour window.