Install SBo package found in /tmp directory.

def install(self):
        """Install SBo package found in /tmp directory.
        """
        binary = slack_package(self.prgnam)
        print("[ {0}Installing{1} ] --> {2}".format(self.green, self.endc,
                                                    self.name))
        PackageManager(binary).upgrade(flag="--install-new")