Updates to Chief Architect are released periodically and are free of charge.
The best way to obtain the correct update is from within the program itself. In Chief Architect, select Help> Download Program Updates from the menu and you will be directed to the correct update for your version.
To download from this page instead, please select the version of Chief Architect you are using:
If you are using an older version of Chief Architect, you may be interested in upgrading to X11.