For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:chodorenko/openSUSE_Tumbleweed/home:chodorenko.repo
zypper refresh
zypper install simple-scan
For 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:chodorenko/15.6/home:chodorenko.repo
zypper refresh
zypper install simple-scan
For 15.4 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:chodorenko/15.4/home:chodorenko.repo
zypper refresh
zypper install simple-scan