For openSUSE Slowroll run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:junaids/openSUSE_Slowroll/home:junaids.repo
zypper refresh
zypper install HeroicGamesLauncher
For 16.0 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:junaids/16.0/home:junaids.repo
zypper refresh
zypper install HeroicGamesLauncher
For 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:junaids/15.6/home:junaids.repo
zypper refresh
zypper install HeroicGamesLauncher