Для 15.6 запустите от имени root:
zypper addrepo https://download.opensuse.org/repositories/systemsmanagement:orthos2:django32/15.6/systemsmanagement:orthos2:django32.repo
zypper refresh
zypper install python-UkPostcodeParser
Для 15.5 запустите от имени root:
zypper addrepo https://download.opensuse.org/repositories/systemsmanagement:orthos2:django32/15.5/systemsmanagement:orthos2:django32.repo
zypper refresh
zypper install python-UkPostcodeParser
Для 15.4 запустите от имени root:
zypper addrepo https://download.opensuse.org/repositories/systemsmanagement:orthos2:django32/15.4/systemsmanagement:orthos2:django32.repo
zypper refresh
zypper install python-UkPostcodeParser