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I can not reproduce this problem, it works just fine on OS X over here. And the cache without www is also reachable. Maybe it was a temporary problem. You could also try pip install -U rosinstall_generator, but I don't see how that should make much of a difference if the URL reachability is indeed the issue. Please double check that the URL is not reachable for you: wget http://ros.org/rosdistro/hydro-cache.yaml.gz.