For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:C7NhtpnK/openSUSE_Tumbleweed/home:C7NhtpnK.repo
zypper refresh
zypper install 7zip
For openSUSE Slowroll run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:C7NhtpnK/openSUSE_Slowroll/home:C7NhtpnK.repo
zypper refresh
zypper install 7zip
For 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:C7NhtpnK/15.6/home:C7NhtpnK.repo
zypper refresh
zypper install 7zip