Para openSUSE Tumbleweed corra o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/KDE:Frameworks5:LTS:5.12/openSUSE_Tumbleweed/KDE:Frameworks5:LTS:5.12.repo
zypper refresh
zypper install plasma5-desktop
Para openSUSE Leap 42.3 corra o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/KDE:Frameworks5:LTS:5.12/openSUSE_Leap_42.3/KDE:Frameworks5:LTS:5.12.repo
zypper refresh
zypper install plasma5-desktop
Para openSUSE Leap 15.1 corra o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/KDE:Frameworks5:LTS:5.12/openSUSE_Leap_15.1/KDE:Frameworks5:LTS:5.12.repo
zypper refresh
zypper install plasma5-desktop
Para openSUSE Leap 15.0 corra o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/KDE:Frameworks5:LTS:5.12/openSUSE_Leap_15.0/KDE:Frameworks5:LTS:5.12.repo
zypper refresh
zypper install plasma5-desktop