ok, a friend of mine solved the problem, something in my Mozilla
blocked the download.
I tried the 3 examples from the docs,
but they didn't work right out of the box.
I don't know if I made a wrong installation or if these are (small but
annoying for a beginner) bugs:
1. I had to add the following lines at the top of the code
from sympy import simplify, Symbol, Matrix
circuit.default_toolkit = symbolic
2. at the end the examples misses the "print" and "pylab.show()"
commands
cheers,
Stef