For SLE 15 SP4 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/science:HPC:Backports/SLE_15_SP4/science:HPC:Backports.repo
zypper refresh
zypper install cli11
For SLE 15 SP3 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/science:HPC:Backports/SLE_15_SP3/science:HPC:Backports.repo
zypper refresh
zypper install cli11
For SLE 15 SP2 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/science:HPC:Backports/SLE_15_SP2/science:HPC:Backports.repo
zypper refresh
zypper install cli11