For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:mwilck:suse-module-tools:openSUSE:suse-module-tools:PR-84/openSUSE_Tumbleweed/home:mwilck:suse-module-tools:openSUSE:suse-module-tools:PR-84.repo
zypper refresh
zypper install suse-module-tools
For 15.5 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:mwilck:suse-module-tools:openSUSE:suse-module-tools:PR-84/15.5/home:mwilck:suse-module-tools:openSUSE:suse-module-tools:PR-84.repo
zypper refresh
zypper install suse-module-tools
For 15.4 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:mwilck:suse-module-tools:openSUSE:suse-module-tools:PR-84/15.4/home:mwilck:suse-module-tools:openSUSE:suse-module-tools:PR-84.repo
zypper refresh
zypper install suse-module-tools