plasma5-desktop from home:Vogtinator:boo1196199 project
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Add repository and install manually
For openSUSE Backports SLE-15-SP3 Update run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:Vogtinator:boo1196199/openSUSE_Backports_SLE-15-SP3_Update/home:Vogtinator:boo1196199.repo zypper refresh zypper install plasma5-desktop