For openSUSE Leap 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/devel:automotive/openSUSE_Leap_15.6/devel:automotive.repo
zypper refresh
zypper install dlt-viewer
For openSUSE Leap 15.5 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/devel:automotive/openSUSE_Leap_15.5/devel:automotive.repo
zypper refresh
zypper install dlt-viewer
For openSUSE Leap 15.4 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/devel:automotive/openSUSE_Leap_15.4/devel:automotive.repo
zypper refresh
zypper install dlt-viewer