Once downloaded, run the executable file (Stansys.exe).
It will prompt you to extract the files to C:\STANSYS.
(You may change the destination folder if you wish).
Run the setup.exe file located in the destination folder.
This setup will upgrade a registered ver 4.5, or early ver 5.0,
to the latest version (version 5.01).
You may be required to re-enter your Serial number.