For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:pvarkoly:spielwiese/openSUSE_Tumbleweed/home:pvarkoly:spielwiese.repo
zypper refresh
zypper install freeradius-server
For 15.5 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:pvarkoly:spielwiese/15.5/home:pvarkoly:spielwiese.repo
zypper refresh
zypper install freeradius-server
For 15.4 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:pvarkoly:spielwiese/15.4/home:pvarkoly:spielwiese.repo
zypper refresh
zypper install freeradius-server