For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:Ximi1970:OpenVPN/openSUSE_Tumbleweed/home:Ximi1970:OpenVPN.repo
zypper refresh
zypper install openvpn
For 16.0 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:Ximi1970:OpenVPN/16.0/home:Ximi1970:OpenVPN.repo
zypper refresh
zypper install openvpn
For 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:Ximi1970:OpenVPN/15.6/home:Ximi1970:OpenVPN.repo
zypper refresh
zypper install openvpn