For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:chuller/openSUSE_Tumbleweed/home:chuller.repo
zypper refresh
zypper install kiwix-desktop
For openSUSE Leap 15.1 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:chuller/openSUSE_Leap_15.1/home:chuller.repo
zypper refresh
zypper install kiwix-desktop
For openSUSE Factory ARM run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:chuller/openSUSE_Factory_ARM/home:chuller.repo
zypper refresh
zypper install kiwix-desktop