For openSUSE Slowroll run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:sapphirepro:build/openSUSE_Slowroll/home:sapphirepro:build.repo
zypper refresh
zypper install nextcloud-desktop
For 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:sapphirepro:build/15.6/home:sapphirepro:build.repo
zypper refresh
zypper install nextcloud-desktop
For 15.5 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:sapphirepro:build/15.5/home:sapphirepro:build.repo
zypper refresh
zypper install nextcloud-desktop
For 15.4 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:sapphirepro:build/15.4/home:sapphirepro:build.repo
zypper refresh
zypper install nextcloud-desktop