gscan2pdf from home:Simmphonie project
Select Your Operating System
Add repository and install manually
For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:Simmphonie/openSUSE_Tumbleweed/home:Simmphonie.repo zypper refresh zypper install gscan2pdf