Hey Antonio,
thank you for reporting this issue.
All the steps you did are correct.
It seems the component "msysgit" is not extracted correctly and not added to the environment PATH.
The workaround is to download "msysgit" manually and install it.
That makes Git available on your system and the command `bin/node/bower install` will run smoothly.
(Sidenote: running `bower install` in ConEmu looks kind of weird, because of the animated loading indicator, which adds newlines.
I don't know, if this is a bug in ConEmu or if there is some kind of configuration directive to tweak the new-line handling and the output.)
Best, Jens