Unfortunately itch.io interface is a bit confusing, pushing new players to downloads instead of the game page, so new people ask about this quite often. But Beta and Early Access versions are browser-only to protect the extended contents, no download is available. After adding it to your library you can access those from their pages:
- https://kitolmek.itch.io/myjlc-patreon for Early Access,
- https://kitolmek.itch.io/myjlc-beta for Beta.
Meantime public release includes downloadable .exe and .apk files, but no additional contents.