When downloading rpm package from www.cendio.com and open it by clicking on the package, gnome-software is launched and presents following dialog message: Sorry, this did not work The file is not supported. [ Close ] Reproducible with 4.7.0 client downloaded from www.cendio.com on a Fedora 25 Workstation
https://bugzilla.redhat.com/show_bug.cgi?id=1397925: "Thanks, should be fixed in gnome-software 3.22.5." ... gnome-software-3.22.5-1.fc25, libappstream-glib-0.6.7-2.fc25 has been pushed to the Fedora 25 testing repository.
Works well with gnome-software-3.22.5-1 and libappstream-glib-0.6.7-3 which are both available in the normal fedora updates repo now.