Jacars2 is a free (as in beer) program designed to connect you to ACARSD servers around the world via the Internet. 
Jacars2 requires the Java runtime environment (JRE) and an internet connection. You are on your own for the connection, but get Java now.
Provided you have the JRE installed, simply unzip Jacars2 and run Jacars2.exe.
A discontinued copy of JACARS 2.0 ACARSD Client software can be donwloaded here.
Thanks for the JACARS program Simone. I had been looking for a few days for a simple program, and this is working very well here in NW England. 73s Bernard (G0 JOG)
Caro Simone. Ricevo i messaggi ACARS sul ricevitore VHF e li demodulo con SKYSWEEP. Vorrei sapere se esiste un tutorial che mi consenta di tradurre il contenuto del messaggio. A parte la posizione, l’aeromobile e la sigla del volo non riesco a tradurre il resto. Aspetto notizie e ti ringrazio. paolo
thanks for the program it is very good and usefull
thanks for the program