For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:palant/openSUSE_Tumbleweed/home:palant.repo
zypper refresh
zypper install endless-sky
For openSUSE Slowroll run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:palant/openSUSE_Slowroll/home:palant.repo
zypper refresh
zypper install endless-sky
For 16.0 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:palant/16.0/home:palant.repo
zypper refresh
zypper install endless-sky
For 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:palant/15.6/home:palant.repo
zypper refresh
zypper install endless-sky