This is SuperMemo 8 for Windows 3.1 (build: 8.46, 1.05MB, 16-bit)
You can download and start using the program immediately. You will yet need a registration password that will be sent to you within a business day.
Important! This software is retained at this site as a collector item only. It is freeware; however, this purchase will later help you upgrade to newer versions. If you do not plan to upgrade, go to freeware sites to download SuperMemo 98 free