For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/KDE:Qt6/openSUSE_Tumbleweed/KDE:Qt6.repo
zypper refresh
zypper install qt6-opcua
For openSUSE Factory zSystems run the following as root:
zypper addrepo https://download.opensuse.org/repositories/KDE:Qt6/openSUSE_Factory_zSystems/KDE:Qt6.repo
zypper refresh
zypper install qt6-opcua
For openSUSE Factory PowerPC run the following as root:
zypper addrepo https://download.opensuse.org/repositories/KDE:Qt6/openSUSE_Factory_PowerPC/KDE:Qt6.repo
zypper refresh
zypper install qt6-opcua
For openSUSE Factory ARM run the following as root:
zypper addrepo https://download.opensuse.org/repositories/KDE:Qt6/openSUSE_Factory_ARM/KDE:Qt6.repo
zypper refresh
zypper install qt6-opcua