Daft wee game is still updating the itch.io version, but not with betas, just the stable version. It was released as stable to Steam a week ago or so, pushing that version to itch.io now.
Viewing post in Are you still going to update the itch.io version?
Well, tbh Galimulator 5.0 isn’t that much of an improvement to be worth it. And Galimulator on Steam isn’t being updated really so there’s that.
Anyways, I might backport the Galimulator CE modpack to 4.10 (especially because Galimulator can no longer be purchased on Steam in Germany) - it’s a bit of work, but mostly overdue work, so stay tuned (will only take a year or so)!