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 16 (see Freeware Upgrade). In the future, you will also be able to upgrade to any SuperMemo at a huge discount (usually at just 20-30% of the original price).
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 16
- in the future, keep upgrading to new versions of your choice (once registered in this store, you are perpetually eligible)