For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:iphelf/openSUSE_Tumbleweed/home:iphelf.repo
zypper refresh
zypper install Mogan
For 15.5 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:iphelf/15.5/home:iphelf.repo
zypper refresh
zypper install Mogan
For 15.4 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:iphelf/15.4/home:iphelf.repo
zypper refresh
zypper install Mogan