Signal Desktop has been removed from the Fedora Copr repository, but, you can use the OBS version from OpenSuse create /etc/yum.repos.d/network-im-signal.repo [network_im_signal] name=Signal Messaging Devel Project (Fedora) type=rpm-md baseurl=https://download.opensuse.org/repositories/network:/im:/signal/Fedora_$releasever/ gpgcheck=1 gpgkey=https://download.opensuse.org/repositories/network:/im:/signal/Fedora_$releasever/repodata/repomd.xml.key enabled=1 Then execute dnf -y install signal-desktop