MarsSeed [1] filed a deletion request for avogadro-git [2]: Avogadro1 is discontinued since 2021, repo archived. [a]
Development of the successor, Avogadro2 continues in a separate repo called avogadroapp. There is an AUR package for that. [a]: https://github.com/cryos/avogadro [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/avogadro-git/
