Installing : Installing SA and SA XT on same machine : Installation requirements
  
Installation requirements
There are some requirements and restrictions to consider when you install both products on the same computer. Among the requirements are the following:
You must install System Architect first, and then install System Architect XT. When you install System Architect XT, it will use the same System Architect installation directory, without prompting you to choose an different directory.
The versions of System Architect and System Architect XT must be the same.
Note You cannot run System Architect while you are running System Architect XT as a server.