For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/network:messaging:xmpp/openSUSE_Tumbleweed/network:messaging:xmpp.repo
zypper refresh
zypper install omemo-utils
For openSUSE Slowroll run the following as root:
zypper addrepo https://download.opensuse.org/repositories/network:messaging:xmpp/openSUSE_Slowroll/network:messaging:xmpp.repo
zypper refresh
zypper install omemo-utils
For 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/network:messaging:xmpp/15.6/network:messaging:xmpp.repo
zypper refresh
zypper install omemo-utils
For 15.5 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/network:messaging:xmpp/15.5/network:messaging:xmpp.repo
zypper refresh
zypper install omemo-utils