The development system comes in two flavors:
The distribution consists of a single, self-installing executable (InstallSICStus.exe) containing development system, runtime support files, library sources, and manuals. Note that the installer itself asks for a decyption key, when started. This decryption key is different from the license code.
SICStus Prolog requires a license code to run. You should have received from SICS your site name, the expiration date and the code. This information is normally entered during installation:
Expiration date: ExpirationDate Site: Site License Code: Code
but it can also be entered by starting SICStus with Administrative rights from the Start menu (spwin.exe) and selecting Enter License from the Settings menu. Entering the license requires Administrative rights. Running SICStus should be possible from a limited account.