Older versions of SuperMemo are successively released as freeware. By purchasing any of these freeware items you get registered in this store and become eligible to instantly upgrade to SuperMemo 17 (see Freeware Upgrade). In the future, you will also be able to upgrade to any SuperMemo at a big discount. Your cheapest pathway to new SuperMemos is: order SuperMemo 15 Freeware below (or any other collector item) if you like SuperMemo 15, use Freeware Upgrade to get SuperMemo 17 in the future, keep upgrading to new versions of your choice (once registered in this store, you are perpetually eligible) Freeware Upgrade (to SuperMemo 17) $27.00 SuperMemo 7 Freeware $2.00 SuperMemo 8 Freeware $2.00 SuperMemo 9 Freeware $2.00 SuperMemo 10 Freeware $2.00 SuperMemo 11 Freeware $2.00 SuperMemo 12 Freeware $2.00 SuperMemo 13 Freeware $2.00 SuperMemo 14 Freeware $2.00 SuperMemo 15 Freeware $2.00 With SuperMemo you can forget about forgetting!