For SLE 12 SP3 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/Virtualization:Appliances/SLE_12_SP3/Virtualization:Appliances.repo
zypper refresh
zypper install kiwi
For SLE 12 SP2 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/Virtualization:Appliances/SLE_12_SP2/Virtualization:Appliances.repo
zypper refresh
zypper install kiwi
For SLE 11 SP4 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/Virtualization:Appliances/SLE_11_SP4/Virtualization:Appliances.repo
zypper refresh
zypper install kiwi