For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:icodrop:atomic/openSUSE_Tumbleweed/home:icodrop:atomic.repo
zypper refresh
zypper install atomic-update
For openSUSE Slowroll run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:icodrop:atomic/openSUSE_Slowroll/home:icodrop:atomic.repo
zypper refresh
zypper install atomic-update
For 16.0 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:icodrop:atomic/16.0/home:icodrop:atomic.repo
zypper refresh
zypper install atomic-update