After the download completes, make the directory you want to put
Sim8 in, and then extract it from the tar file. After that, you
can either read the documentation by pointing a browser at
the file Documentation/index.html, or else start Sim8 as shown
below and then use the Information->Documentation menu.
mkdir Sim8
cd Sim8
tar xvf Sim8-13Feb2002.tar
java -jar Sim8.jar