I downloaded the last demo version of C17-Compiler from the Microchip site, but every time I run it, it gives me this message:

C:\mcc\bin>c17demo
    MPLAB-C17 v2.30.03 (demo)
    Copyright 1997, 1998 Microchip Technology Inc.
    Demo stamp not found..

Where am I wrong? What should I do to make the compiler work?

Please, somebody help me ! Thank you!

Massimiliano