dnf install apt dpkg -y
echo 'deb [arch=amd64 signed-by=/usr/share/keyrings/signal-desktop-keyring.gpg] https://updates.signal.org/desktop/apt xenial main' | tee -a /etc/apt/sources.list.d/signal-xenial.list
wget -O- https://updates.signal.org/desktop/apt/keys.asc | gpg --dearmor > signal-desktop-keyring.gpg
cat signal-desktop-keyring.gpg | tee -a /usr/share/keyrings/signal-desktop-keyring.gpg > /dev/null
apt update
cd /tmp/
apt-get download signal-desktop
dpkg --force-depends -i signal-desktop_5.23.0_amd64.deb
desktop-file-install /usr/share/applications/signal-desktop.desktop
if you want uninstall it
dpkg --remove signal-desktop