Для openSUSE Tumbleweed запустите от имени root:
zypper addrepo https://download.opensuse.org/repositories/home:ojkastl_buildservice:eduMFA/openSUSE_Tumbleweed/home:ojkastl_buildservice:eduMFA.repo
zypper refresh
zypper install python-croniter
Для 15.6 запустите от имени root:
zypper addrepo https://download.opensuse.org/repositories/home:ojkastl_buildservice:eduMFA/15.6/home:ojkastl_buildservice:eduMFA.repo
zypper refresh
zypper install python-croniter
Для 15.5 запустите от имени root:
zypper addrepo https://download.opensuse.org/repositories/home:ojkastl_buildservice:eduMFA/15.5/home:ojkastl_buildservice:eduMFA.repo
zypper refresh
zypper install python-croniter