For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/security:OpenVAS:STABLE:v8/openSUSE_Tumbleweed/security:OpenVAS:STABLE:v8.repo
zypper refresh
zypper install openvas-scanner
For openSUSE Leap 42.3 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/security:OpenVAS:STABLE:v8/openSUSE_Leap_42.3/security:OpenVAS:STABLE:v8.repo
zypper refresh
zypper install openvas-scanner
For openSUSE Leap 42.2 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/security:OpenVAS:STABLE:v8/openSUSE_Leap_42.2/security:OpenVAS:STABLE:v8.repo
zypper refresh
zypper install openvas-scanner
For openSUSE Leap 42.1 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/security:OpenVAS:STABLE:v8/openSUSE_Leap_42.1/security:OpenVAS:STABLE:v8.repo
zypper refresh
zypper install openvas-scanner