For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/spins:invis:rootpack:15:testing/openSUSE_Tumbleweed/spins:invis:rootpack:15:testing.repo
zypper refresh
zypper install invis-rp-dnsserver
For 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/spins:invis:rootpack:15:testing/15.6/spins:invis:rootpack:15:testing.repo
zypper refresh
zypper install invis-rp-dnsserver
For 15.5 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/spins:invis:rootpack:15:testing/15.5/spins:invis:rootpack:15:testing.repo
zypper refresh
zypper install invis-rp-dnsserver