Actually two major version per year was the standard of SAMSIM development in the past also...
v0.924 Beta (2012.03.24)
Beta version
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v0.923 (2011.12.25)
Introduced the SA-75M Dvina (SA-2F) system, and the biggest bombing after World War-II.
v0.922 (24.06.2011)
Include NASA digital terrain model (90m horizontal resolution), to simulate realistic earth clutter
v0.921 (05.02.2011)
Include the S-200VE Vega (SA-5B Gammon) system.
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v0.918 (03.09.2010)
Include the 2K11M1 KRUG-M1 system (SA-4B Ganef)
v0.917 (04.05.2010)
Include the situation of the 1st of May 1960, the famous U-2 shot of Francis Gary Powers above Sverdlovsk.
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v0.915 (31.12.2009)
Includes the situation of Hanoi (Linebacker-II raid 19.12.1972.), with B-52's, Wild Weasel's, and SR-71.
v0.912 (10.10.2009)
First public release