For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:cobbler-project:release33/openSUSE_Tumbleweed/home:cobbler-project:release33.repo
zypper refresh
zypper install hivex
For 15.4 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:cobbler-project:release33/15.4/home:cobbler-project:release33.repo
zypper refresh
zypper install hivex
For 15.3 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:cobbler-project:release33/15.3/home:cobbler-project:release33.repo
zypper refresh
zypper install hivex