For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:SStepke/openSUSE_Tumbleweed/home:SStepke.repo
zypper refresh
zypper install Magics
For openSUSE Factory run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:SStepke/openSUSE_Factory/home:SStepke.repo
zypper refresh
zypper install Magics
For 15.4 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:SStepke/15.4/home:SStepke.repo
zypper refresh
zypper install Magics