(EDIT)
alright so I finally found a full free version but now I have another problem, you know how when you save a picture as a png and that tab pops up? the top one is for having a pic with a white BG and the bottom one is for a transparent BG? that tab doesn't show up for me at all, has anyone ever had the same problem, if so do you think you could help me out, that will probably be the last paint tool sai related thing

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hey guys does anyone know of a full and safe (FREE) version of sai?
pls link it to me, I would appreciate that greatly.