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