For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:mcepl/openSUSE_Tumbleweed/home:mcepl.repo
zypper refresh
zypper install topgit
For openSUSE Factory zSystems run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:mcepl/openSUSE_Factory_zSystems/home:mcepl.repo
zypper refresh
zypper install topgit
For openSUSE Factory ARM run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:mcepl/openSUSE_Factory_ARM/home:mcepl.repo
zypper refresh
zypper install topgit
For 15.5 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:mcepl/15.5/home:mcepl.repo
zypper refresh
zypper install topgit
For 15.4 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:mcepl/15.4/home:mcepl.repo
zypper refresh
zypper install topgit