For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:etamPL/openSUSE_Tumbleweed/home:etamPL.repo
zypper refresh
zypper install sequoia-octopus-librnp
For openSUSE Factory PowerPC run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:etamPL/openSUSE_Factory_PowerPC/home:etamPL.repo
zypper refresh
zypper install sequoia-octopus-librnp
For openSUSE Factory ARM run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:etamPL/openSUSE_Factory_ARM/home:etamPL.repo
zypper refresh
zypper install sequoia-octopus-librnp
For 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:etamPL/15.6/home:etamPL.repo
zypper refresh
zypper install sequoia-octopus-librnp