For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:cahu:branches:Base:System:1251801/openSUSE_Tumbleweed/home:cahu:branches:Base:System:1251801.repo
zypper refresh
zypper install snapper
For openSUSE Factory run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:cahu:branches:Base:System:1251801/openSUSE_Factory/home:cahu:branches:Base:System:1251801.repo
zypper refresh
zypper install snapper
For 16.0 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:cahu:branches:Base:System:1251801/16.0/home:cahu:branches:Base:System:1251801.repo
zypper refresh
zypper install snapper