I am not sure exactly..but I guess it has something to do with the network..while you are installing if use -- trust host problem may get resolved..I tried it..for me I solved this issue when I tried from another network
— May be it is trying to fetch the module from the site where it is unable to verify the certificate.. something like that... I don't know.. This is as far as I understand..u can Google it.. correct me if u know something