I have built the entire LinuxSampler-suite and sfizz (latest versions) for three Fedora releases (41 - 43). They are publicly available on COPR.
https://copr.fedorainfracloud.org/ You can either download the packages or easier, install them via dnf. Instructions are included in the following links.
https://copr.fedorainfracloud.org/coprs/lexridge/linuxsampler-suite/
https://copr.fedorainfracloud.org/coprs/lexridge/sfizz-ui/
Please test and while they all work for me, hopefully they will work for you too.