For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:AndnoVember:LXQT/openSUSE_Tumbleweed/home:AndnoVember:LXQT.repo
zypper refresh
zypper install qdirstat
For openSUSE Leap 15.2 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:AndnoVember:LXQT/openSUSE_Leap_15.2/home:AndnoVember:LXQT.repo
zypper refresh
zypper install qdirstat
For openSUSE Leap 15.1 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:AndnoVember:LXQT/openSUSE_Leap_15.1/home:AndnoVember:LXQT.repo
zypper refresh
zypper install qdirstat
For openSUSE Leap 15.0 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:AndnoVember:LXQT/openSUSE_Leap_15.0/home:AndnoVember:LXQT.repo
zypper refresh
zypper install qdirstat
For 15.4 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:AndnoVember:LXQT/15.4/home:AndnoVember:LXQT.repo
zypper refresh
zypper install qdirstat