For openSUSE Slowroll run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:Simmphonie/openSUSE_Slowroll/home:Simmphonie.repo
zypper refresh
zypper install virt-manager
For 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:Simmphonie/15.6/home:Simmphonie.repo
zypper refresh
zypper install virt-manager
For 15.5 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:Simmphonie/15.5/home:Simmphonie.repo
zypper refresh
zypper install virt-manager
For 15.4 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:Simmphonie/15.4/home:Simmphonie.repo
zypper refresh
zypper install virt-manager