To try 'StCAD' in VisualWorks 7.x:
Install the VisualWorks enviroment first.
Create a directory, say, C:\vw7xnc\stcad8 for the downloads.
Download stcad8.zip (2,287,168 bytes).
Download patch83.zip (8,817 bytes).
The files should be good on all platforms supported by VisualWorks.
Unzip stcad8.zip into the same directory.
Unzip patch8*.zip into the same directory. Let it overwrite other files.
Save a new image in the directory and launch it from you operating system.
Load parcel C:\vw7xnc\stcad8\stcadstart8.pcl.
Click 'Yes to All' for all prompts.
Launch 'freeCAD' with doit 'StCAD.Editor open', if it is not already launched.
Inside 'freeCAD', click Explain/Quick Test/ and Explain/Quick Start/, to find instructions and tutorials.