You can download and start using the program immediately. You will then receive your unlock password and further instructions within a business day
The size of the installer to download is ~540kB. You will download the remaining components at installation. You can always rerun the installer to check for updates and patches to SuperMemo. Updates are not automatic
When downloading, save the installer with the extension EXE (as sm16inst.exe) on your hard disk and run it.
Newer Windows will complain that SuperMemo comes from "Unknown publisher". If you are sure you have downloaded from super-memo.com, ignore that message