Rerouted (renamed, verified). The GitHub user or repository was renamed. The tag is still there, at the new name. The Lamdera package server serves a copy recovered from https://github.com/skit-ai/elm-flow-chart.

What we checked: The repo moved to github.com/skit-ai/elm-flow-chart and tag 3.0.0 is there; its commit 800ffb3eb22a is from 2019-06-07 00:08 UTC, before the version was published (2019-06-07 00:09 UTC); every file Elm uses matches a copy in a Lamdera package cache from 2021-02-13, from before the change; elm.json is byte-identical to package.elm-lang.org's; the exposed modules match docs.json; the zip's SHA-1 is not the published one (GitHub's zip no longer comes out byte for byte the same), so the contents were checked instead.

The Lamdera compiler uses this copy and prints a one-line notice saying so. elm itself fails to download this version.

Details · package.elm-lang.org's zip: https://github.com/vernacular-ai/elm-flow-chart/zipball/3.0.0/