Finally the FreeCAD-addons-master run good and I am enjoying learning the capabilities of FreeCad. After read carefully the phyton code I noticed that the path include a subfolder mod so I created this subfolder after freeCad and that was the issue:
One problem remains: The assemble2 workbench is still hidden although into the FreeCAD-addons-master appear as installed. I am not figure out the inconvenient, may be the same path issue inside of its phyton code.
Here is the screen shot of the issue
Thanks in advance