When opening them in FreeCAD 1.0 RC2, a recalicuration error occurs in each file. When opening or recalicurating them in FreeCAD 0.19.3, 0.20.2 and 0.21.2, there are ...
This book should be updated for the recent release, esp. after migration to Python3 + Pyside2. I plan another release for FreeCAD 0.19 dev near Xmas time.