I've extracted some key information from the text about FreeCAD:

1. A powerful 3D CAD modeler and drawing tool.

2. Open-source and modular, allowing for advanced extension and customization.

3. Based on OpenCasCade geometry kernel, Coin 3D library, and Python API.

4. Supports parametric modeling, allowing easy modification of designs.

Upgrade Information:

1. FreeCAD version 0.20.1 can be upgraded to version 0.21.0 on Win10.

2. The upgrade will install in a separate folder, leaving the existing FC version alone.

3. However, they share a config directory, which may cause issues.

4. Users can specify a different directory using a command-line switch for isolation.

What FreeCAD is:

1. An open-source parametric 3D modeler designed for real-life object design of any size.

2. Suitable for creating virtual 2D or 3D models for CAx, CAD, CAE, MCAD, or PLM.

3. Particularly beneficial for product designers and engineers.

Release Information:

1. The FreeCAD team has announced the release of version 0.21.1 (free install).

Let me know if you'd like me to help with anything else!

FreeCAD 0.21.1 free instals