For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:shundhammer:qdirstat-stable/openSUSE_Tumbleweed/home:shundhammer:qdirstat-stable.repo
zypper refresh
zypper install qdirstat
For openSUSE Slowroll run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:shundhammer:qdirstat-stable/openSUSE_Slowroll/home:shundhammer:qdirstat-stable.repo
zypper refresh
zypper install qdirstat
For 16.0 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:shundhammer:qdirstat-stable/16.0/home:shundhammer:qdirstat-stable.repo
zypper refresh
zypper install qdirstat
For 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:shundhammer:qdirstat-stable/15.6/home:shundhammer:qdirstat-stable.repo
zypper refresh
zypper install qdirstat