Simply download your existing license certificate and place it in the SAI 2 folder to unlock the saving and loading features. Final Verdict
SAI 2 is currently provided as a free update for anyone who owns a license for the original Paint Tool SAI.
Canvas rotation is now fluid (not just fixed angles). The has been upgraded to support up to 20-axis rotational symmetry (perfect for mandalas or complex character faces).
SAI 2 is incredibly lightweight. It launches in seconds, and even on older hardware, there is virtually zero brush lag. It doesn't require a high-end GPU to run smoothly, making it the best choice for laptop users or those on a budget. Color Mixing