Source : Free On-Line Dictionary of Computing

demo version
     
        1. An early, barely-functional version of a program which
        can be used for demonstration purposes as long as the operator
        uses *exactly* the right commands and skirts its numerous
        bugs, deficiencies, and unimplemented portions.
     
        2. A special version of a finished program (frequently with
        some features crippled) which is distributed at little or no
        cost to the user for enticement purposes.  See {crippleware}.
     
        (1994-11-04)