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After the 31 days trial period expired and if you'd like to continue using PaintTool SAI, you need to purchase a "Software License". "Software License" is shipped as digital certificate. When your order is completed, you will receive download password for your software license certificate file, and you can download your license certificate file from "Download Software License Certificate File" page linked below. if you downloading and installing your license certificate file to your SAI's program folder, you will remove trial limitation of SAI in current version 1.x.x, and you can use this version software without any trial limitation. (This license include for all minor upgrade in current version 1.x.x, and not include major upgrade fee like ver.1.x.x to 2.x.x).