SAI is not exactly free, is just a very old pirated program that it's company ended up giving up after nobody bought it legally in almost all it's life. Since it was pirated very long ago (this was way back in the 2000s!) it just got the fame of being free, mostly in western countries. Only in Japan the users do buy it. Not judging anyone using it, just saying this because not many people did noticed it. Also Happy New Year to all.