Avogadro 1 is not under active development, the repository was archived in September 2021. Development of Avogadro 2 is being done at https://github.com/openchemistry/avogadrolibs. Avogadro is an advanced molecular editor designed for cross-platform use in computational chemistry, molecular modeling, bioinformatics, materials science, and related areas.
Version key is wrongly used for the application version, when that (optional) key is only about the desktop entry specification.
See also: https://specifications.freedesktop.org/desktop-entry-spec/desktop-entry-spec-latest.html#basic-format