Radarbox24 do NOT have any package for installation on x86_64 machines. They have only armhf and arm64 deb packages. On Debian based OS these packages can be downloaded (after adding rb24 repository to apt sources list) by adding --download-only to install command like below:
sudo apt install --download-only rbfeeder
This will download rbfeeder deb package and any dependencies it needs, and place them in folder /var/cache/apt/archives from where you can get it.
However radarbox feeder can be installed on Linux x86_64 computers through Docker. I have successfully installed it on Debian-11 x86_64 OS, but I am not sure if it can be installed on rpm based OS. You may try and see.
https://github.com/sdr-enthusiasts/docker-radarboxThe decoder offered by this Docker site is readsb-protobuff. If you already have a decoder installed, you may no need to install readsb-protobuf.