The original free version is often hosted on GitHub. You can search for stephan-langer/archipack (or similar archives if the main repo has been updated to Pro).
Archipack is a powerful add-on for Blender that streamlines the design process for architects, interior designers, and 3D artists. With Archipack, you can create complex designs quickly and efficiently, thanks to its intuitive interface and robust feature set. From walls and windows to doors and furniture, Archipack provides a comprehensive set of tools to help you bring your ideas to life. archipack blender 2.8 free download
Instead of modeling every vertex of a window frame, you simply click "Window" and adjust parameters like height, width, and number of panes in real-time. The original free version is often hosted on GitHub