SuperMemo 18 Upgrade

SuperMemo helps you forget about forgetting. Documentation: https://help.supermemo.org/Support: https://supermemopedia.com/Science: https://supermemo.guru/ Who qualifies for the upgrade:* customers who bought any products from SuperMemo Store before May 1, 2023 (old SuperMemos, collection, etc.)* customers who bought any shrink-wrapped SuperMemoWhen ordering specify your previous order number, or registration number, or any identifiable detail(s) of your prior purchase.Note that SuperMemo 19 has already been released, and there is an upgrade too.