Rerouted (regenerated, verified). Same repository and tag, but GitHub now builds the zip with different bytes, so it no longer matches the SHA-1 package.elm-lang.org recorded. The Lamdera package server serves a copy recovered from https://github.com/arowM/elm-sequential-test.
What we checked: Rebuilt with git archive from commit cc52fa00637f of https://github.com/arowM/elm-sequential-test (zip prefix arowM-elm-sequential-test-6f19823/, America/Los_Angeles times, the tag object 6f1982339b06 it had before it was re-made, tagger time 2022-02-10 19:06 UTC): the zip is byte-identical to the one package.elm-lang.org recorded, SHA-1 cf0bb0c55851c41e52ed280818567272ce18292d.
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/arowM/elm-sequential-test/zipball/1.0.2/