For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:fusionfuture:anki/openSUSE_Tumbleweed/home:fusionfuture:anki.repo
zypper refresh
zypper install anki
For 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:fusionfuture:anki/15.6/home:fusionfuture:anki.repo
zypper refresh
zypper install anki
For 15.5 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:fusionfuture:anki/15.5/home:fusionfuture:anki.repo
zypper refresh
zypper install anki
For 15.4 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:fusionfuture:anki/15.4/home:fusionfuture:anki.repo
zypper refresh
zypper install anki