I think to prevent the game from leaking too quickly, Inatari passes the download link via DM to their Patreons. Although I'm actually not 100% sure about this, but whenever Inatari publishes a small preview of the game in X it means that a new version is already available. If we look at the Inatari X there is a small preview of version 4.0.
I was supporting Inatari on Patreon, but unfortunately my subscription expired a few days before the preview was released on X, so I'm not 100% if the download link for the game is now being passed by DM, or if the 4.0 version isn't out yet.