Для 16.0 запустите от имени root:
zypper addrepo https://download.opensuse.org/repositories/home:fee:platon/16.0/home:fee:platon.repo
zypper refresh
zypper install openvpn
Для 15.6 запустите от имени root:
zypper addrepo https://download.opensuse.org/repositories/home:fee:platon/15.6/home:fee:platon.repo
zypper refresh
zypper install openvpn
Для 15.5 запустите от имени root:
zypper addrepo https://download.opensuse.org/repositories/home:fee:platon/15.5/home:fee:platon.repo
zypper refresh
zypper install openvpn
Для 15.4 запустите от имени root:
zypper addrepo https://download.opensuse.org/repositories/home:fee:platon/15.4/home:fee:platon.repo
zypper refresh
zypper install openvpn