Run the app directly from a USB or cloud drive.
While there is no "official" version explicitly marketed as "PaintTool SAI 2 Portable," the legitimate software effectively functions as a portable application PaintTool SAI 2 is currently distributed as a technical preview (beta) paint tool sai 2 portable
However, official SAI 2 is not free. It requires a license key (purchased through the official website or via a PayPal transfer to the developer). There is no "official" portable version published by SYSTEMAX. Run the app directly from a USB or cloud drive