For openSUSE Factory run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:Psheng:Games/openSUSE_Factory/home:Psheng:Games.repo
zypper refresh
zypper install prismlauncher
For 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:Psheng:Games/15.6/home:Psheng:Games.repo
zypper refresh
zypper install prismlauncher
For 15.5 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:Psheng:Games/15.5/home:Psheng:Games.repo
zypper refresh
zypper install prismlauncher